Industry & Invention

Post, TX

Marjorie Merriweather Post was the daughter of cereal magnate C. W. Post, who founded this West Texas colony town in 1906. When drought crippled the young farming community after 1917, she stepped in with relief that kept the local economy alive. Over a long life she became one of America's leading philanthropists in the arts and humanities, endowing colleges, scout camps, and youth-music programs.

Hood River, OR

The Mt. Hood Hotel Annex, dating to 1911, went up during Hood River's early-twentieth-century boom, when the railroad and the valley's famous apple orchards brought travelers and new money into the growing town. Its place on the National Register of Historic Places, along with Oregon's special-assessment program, marks it as a survivor of that formative commercial era.

Hemphill, TX

Mt. Sinai Cemetery has served the families of southeastern Sabine County since its first burial in 1894, on land the Lutcher & Moore Lumber Company deeded in 1955. Some graves here are older still, relocated from the Morris, Anthony, and Robertson cemeteries after the Toledo Bend Reservoir flooded their original ground by 1968. Maintained today by a local association, it remains a tangible record of the county's timber-country past.

Bangs, TX

This hilltop graveyard has served the Thrifty and Fry communities of Brown County for well over a century, its oldest legible burial dating to 1864 and a weathered rock slab hinting at use as early as 1862. Among those laid to rest are pioneer settler Charles Mullins, who brought his family west in 1858, people killed in frontier Indian attacks, and workers caught up in the oil boom of 1926–27. The stones read like a timeline of the West Texas frontier, from first settlement through the derricks of the petroleum age.

Belton, TX

German immigrant Fred Muehlhause reached Texas in 1885, married Louise Albrecht in 1892, and worked as a craftsman shoemaker before opening the Belton Shoe Shop downtown in 1906. A respected civic leader, he was elected city alderman in 1907 and had builder James M. Scott construct this Queen Anne residence in 1908 to his own written specifications, complete with a spring-fed limestone cistern. The house and its carriage, wash, and smoke houses stayed in the family until 1992.

Muenster, TX

In 1889 the Flusche brothers contracted to sell 22,000 acres along the Missouri, Kansas & Texas Railroad, and Jot Gunter donated land for a school, church, cemetery, and park. The first Mass on December 8, 1889, marked the founding of this German Catholic town, whose settlers persevered through drought, typhoid, and tornadoes that twice destroyed their church. Cooperative ventures in insurance and bulk marketing, along with a 1926 oil boom, carried the farming and dairy community into prosperity.

Houston, TX

In 1909, banker William Mulcahy and his wife Mattie bought this newly built home in the developing Houston Heights, where Mulcahy was climbing from bank teller to bank president. Its Dutch Colonial Revival design is distinctive: a T-shaped cross-gambrel roof, native cypress siding, and an inset front porch on square paneled posts. The family held the house for ninety years, a rare span of continuous ownership.

Muldoon, TX

First settled in the 1830s on land from an 1831 Spanish grant through Stephen F. Austin, the Muldoon community took its name from Father Miguel Muldoon, an Irish-born, Spanish-educated priest who ministered to Austin's colonists and received leagues of land in return. The town boomed after the San Antonio and Aransas Pass Railroad arrived in 1887, gaining stores, churches, a hotel, a cotton gin, and its distinctive 1890 precinct courthouse. Muldoon blue sandstone from the local quarry went into courthouses, churches, and even Galveston's coastal jetties before the community faded with the railroad's decline.

Jasper County, GA

In the cotton country of middle Georgia, a farm mule named John earned something almost no working animal ever did: a grave and an epitaph. The boast that he "made 200 bales of cotton" measures a lifetime of turning plows and hauling loads across the red-clay fields of Jasper County, where mule power drove the crop that ruled the Southern economy after the Civil War. Long before tractors arrived, a good mule was a farm's most valuable partner, and this small stone marks the genuine affection and respect one such animal could command.

Muncy Creek Township, PA · est. 1947

Around 1772 John Alward raised this valley's first gristmill, a cornerstone of any frontier settlement where neighbors brought grain to be ground into flour and meal. Burned by Native raiders in 1779 amid the Revolution's border warfare, it was rebuilt again and again—new mills rising in 1783 and 1800—and the last of them ground on until 1872, a full century of milling on one spot.

Coolidge, TX

In 1876 Henry Martin Munger began buying and fencing an 1,800-acre Limestone County survey for a great cotton farm, and his sons carried the enterprise far beyond it. Robert Munger patented cotton-processing machinery and built the Continental Gin Company into the nation's largest maker of such equipment, while Stephen became a Dallas banker and SMU trustee. The Munger community around the farm grew into a full village with a school, churches, gin, depot, and railroad before cotton's decline emptied it by the late 1940s.

Yoakum, TX

During the Depression, the small railroad town of Yoakum decided in 1930 — at a packed commission meeting of some 300 residents — to build and own its own electricity rather than buy from an outside utility. The plant that engineers raised in 1932 lit the town until 1938, then served as an auxiliary station and later a city machine shop before local library boosters lovingly converted the sturdy industrial building into a public library in the late 1980s.

San Angelo, TX

When a devastating flood swept down the South Concho River in September 1936, it destroyed much of San Angelo's parks and its public pool. Voters twice went to the polls before a bond—paired with federal Works Progress Administration funds and labor—cleared the way, and work began in 1938. The Pueblo Revival complex designed by John G. Becker opened in 1939, drawing 795 swimmers in its first two days, its exposed vigas and hexagonal stone tower a signature of Depression-era public building.

Tyler, TX

North Carolina native Archibald Michael Murphey opened a jewelry and watchmaking business in Tyler in 1868, drawing on a trade he had begun as a young apprentice. His sons carried it on, and by the early twentieth century a younger son had taken over, moving the store to this site in 1919. Passed down within one family, it long offered watches, diamonds, silver, and even pianos and organs.

Jefferson, TX

Brothers John C. and James M. Murphy came from Tennessee to the booming riverport of Jefferson in 1850 and built this sturdy structure in the busy warehouse district to serve their wholesale cotton business. As steamboat commerce faded, the building found new life—county offices and courts in 1884, then city hall in 1915, sheltering everything from a volunteer fire company to a dance club. A Diebold safe installed in 1877 still stands inside, a working relic of the town's mercantile heyday.

Murphy, TX

Settled in the early 1840s by pioneers from a dozen states drawn to the fertile Blackland Prairie, this community farmed and ranched the tall-grass, black-soil country for well over a century. It took the name Murphy in 1888 when William Murphy granted right-of-way to the St. Louis Southwestern Railroad, though the city itself wasn't formally established until 1958. Founding Maxwell, McMillen, and Murphy families built the stores and schools of an agrarian town that faded by 1970—only to revive in the 1980s as a Dallas suburb.

Murrysville, PA · est. 1960

Drilled in 1878, the Murrysville gas well became one of the most productive in the world and a wonder of the early natural-gas age. When it caught fire in 1881 it burned for years, its roaring, brilliant flame drawing sightseers before engineers finally brought it under control and piped the gas to Pittsburgh's hungry mills and homes. The site helped prove that natural gas could be captured and moved as an industrial fuel.

Houston, TX

The Myer-Hall House rose in 1910 from the drafting tables of Sanguinet and Staats, a firm that helped define the streetscapes of early-twentieth-century Texas. Built for attorney and civic leader Sterling Myer, the half-timbered Tudor Revival house later became the decades-long home of engineer and businessman James Donald Hall and his family. Its gables, sunroom, and porte-cochere capture the aspirations of Houston's growing professional elite.

Houston, TX

Houston's warehouse district grew up east of Main Street along Buffalo Bayou, where waterways and five converging railroads made the city a shipping powerhouse by the Civil War. On this site an 1880s cotton warehouse was converted into a mattery factory and, after 1904, became the Houston branch of the Myers-Spalti mattress and furniture company. Over the following decades the firm added warehouse after warehouse, its buildings—ranging from brick and heavy timber to poured concrete—charting the evolution of Houston's industrial architecture.

Raleigh, NC

From 1879 to 1930 the North Carolina Industrial Association ran the Colored State Fair to serve the state's Black citizens, who were excluded from full participation elsewhere. Held on grounds just north of here between 1891 and 1925, it showcased Black farming, industry, and achievement in the segregated New South. It was a rare public stage of Black pride and enterprise in the Jim Crow era.

Rockingham, NC

On October 4, 1887, delegates gathered in Rockingham to organize the North Carolina Farmers' Alliance, choosing Leonidas L. Polk as its first secretary. The Alliance channeled the grievances of hard-pressed farmers in the Gilded Age, agitating for fairer credit, railroad regulation, and cooperative marketing, and it became a seedbed of the Populist movement.

Nacogdoches, TX

Raised in 1917–1918 to a design from the office of federal architect James A. Wetmore, this brick post office set a note of classical dignity at the center of the Nacogdoches town square. Its Palladian windows and cast-stone trim mark it as a restrained example of the beaux arts style the U.S. Treasury favored for public buildings of the era. It carried the town's mail until 1964, then served in turn as public library and, later, a visitor center.

Arlington, TX

Between 1853 and 1900 dozens of narrow gauge railroads threaded through Texas—cheap to build and run, they served as 'taps' to towns off the main line and as logging roads pushing deep into woods and swamps. They hauled passengers, cattle, and crops like sugar cane, and one line whimsically operated as the 'Two Mules and a Car.' The two engines running at Six Flags Over Texas, built in 1887 and 1903, were rebuilt to original specifications.

Jefferson, TX

Built by Jefferson S. Nash after he arrived in 1846, this was the first iron furnace in Texas, exploiting the region's abundant ore, hardwood for charcoal, and molding clay. Workers poured charcoal and ore down the stack from a ridge behind the furnace, then cast the molten iron into farm tools, cooking pots, and smoothing irons—and, during the Civil War, cannonballs and possibly firearms. Nash struggled constantly for machinery, labor, capital, and transport, yet his works helped launch an East Texas iron industry that grew to at least sixteen operations.

Nashville, TN

Nashville's first firefighting force, a company of volunteers, formed in May 1807, and the city organized its first paid department in 1860 under Chief J.S. Dashiell, equipped with horse-drawn steam engines. A telegraph alarm system arrived in 1875, and the department entered the motor age when Chief A.A. Rozetta used the first automobile in 1910, followed by gasoline-driven engines in 1912. The marker traces a century of the city's evolving fire protection.

Nashville, TN

In Nashville, as in cities across America, the work of firefighters and emergency medical crews grew alongside the dense, fast-growing urban neighborhoods they were sworn to protect. This memorial honors the long line of local first responders who answered calls into burning buildings and to the scenes of accidents and emergencies, some of them never returning home. It gathers the past, present, and future of that service into a single tribute to civic courage.

City of Rochester, NY

Colonel Nathaniel Rochester was a Revolutionary War veteran and Maryland landholder who, in the early 19th century, purchased a tract of land along the Genesee River and laid out the settlement that would grow into the booming flour-milling city bearing his name. This small park in the South Wedge neighborhood was dedicated in 2008 to honor that founder while celebrating the diverse community that thrives there today. The marker links Rochester's frontier-era origins to the everyday life of one of its historic close-knit neighborhoods.

McKeesport, PA · est. 1991

Incorporated in 1869 and in production here at McKeesport by 1872, the National Tube Works grew into the largest pipe manufacturer in the world, its mills feeding the oil fields, waterworks, and factories of an industrializing nation. Absorbed into U.S. Steel in 1901, the plant pioneered advances in pipe inspection before its long run ended when operations ceased in 1987.

Dawson, TX

A flour mill built in the 1860s on the waters of Rock Creek drew pioneer farmers from miles around, who sometimes waited days to grind their wheat into a luxury reserved for Sunday breads and special occasions. Bought in 1867 by John Summers and sons, the mill anchored a growing village of store, school, blacksmith, and post office, with Confederate veterans among its leaders. Though the mill closed in 1881 and the post office soon after, the church, cemetery, and tabernacle still mark the historic community.

Emory, TX

Founded in 1887 by H. W. Martin as "The Argus," this paper became the "Rains County Leader" by 1900 and remained the county's only newspaper. Tom W. Hill, Sr. bought it in 1904 and edited it for more than three decades, beginning a remarkable family stewardship. From 1937 onward the Hill family—father, sons, and daughters—carried the paper forward across generations.

Leakey, TX

This route was one of many Texas "feeder trails" that funneled longhorn cattle north to join the legendary Chisholm Trail above the Red River, driving thousands of animals to market in the years after the Civil War. The drives lasted months and were full of stampedes and the danger of Indian raids, and local settlers rode along, later spinning their experiences into frontier folklore. At times even herds of hogs were driven forty miles down the trail to market.

Tyler, TX

Founded in 1862 by gunsmiths J. C. Short and William Biscoe with Col. George Yarbrough, this Tyler plant contracted to arm Texas troops with thousands of rifles before the Confederate government bought it out in 1863. Staffed by 150 to 200 men—tanners, blacksmiths, carpenters, and draftsmen alongside the gunsmiths—it turned out .54-caliber rifles, cartridges, and canteens by the hundreds of thousands. Its output helped keep Confederate forces west of the Red River supplied against a feared Federal invasion of Texas.

East Columbia, TX

Brothers J. H., George, and David Dance opened a shop on the Brazos River in 1850 that would become one of Texas's few native arms makers. During the Civil War the shop produced revolvers to help arm the Confederacy, prized for their precision. In peacetime the Dances also built machinery for grist mills, cotton gins, sugar refineries, and sawmills.

Kingsville, TX

Capt. Richard King launched this hide-and-tallow works in 1866 to help his ranch recover economically after the Civil War. With beef herds worth little at distant markets, King salvaged value from cull animals by rendering their tallow for soap and saving their hides for leather, boiling the fat in iron vats eighteen feet long on Santa Gertrudis Creek. The plant ran only a few years, but its vats lingered for half a century, and the site is still called "Matanza" — slaughter — pasture, worked today by descendants of the original hands.

Del Rio, TX

On January 12, 1883, near the Pecos High Bridge, two great railroads met and were joined by a silver spike, completing a transcontinental line across the Southwest. The eastern portion had begun in 1850s Texas and was rechartered in 1870 to link Houston and San Antonio to the Rio Grande, while C.P. Huntington drove the Southern Pacific eastward from California. When Huntington and Texas magnate T.W. Pierce reached agreement, their tracks closed the gap.

Canyon, TX

The Panhandle town of Canyon spent years trying and failing to fund a public hospital before Dr. Robert A. Neblett stepped in. A Tennessee-born, University of Texas–trained specialist in children's medicine, he announced in 1937 that he would build one himself, and that year a sixteen-room, air-conditioned hospital rose on 16th Street. It closed while he served nearly two and a half years in the Pacific during World War II, reopened on his return, and cared for Canyon residents and West Texas State students until 1975.

Tyler, TX

Before the waters of Lake Palestine swallowed it, the Neches Saline was a salt lifeline for East Texas—Spanish missionaries recorded its brine springs as early as 1765, and settlers boiled water from shallow wells to harvest the salt a frontier economy could not do without. Local salt-making faded in the 1850s as cheaper English salt arrived, but the Civil War's Federal blockade revived it: one operator was reported to run twelve furnaces here, turning out about a hundred bushels a day for the Confederacy.

Houston, TX

Built in 1926 in one of Houston's new planned neighborhoods, this villa-style house was an experiment in modern building materials, raised in concrete when most homes were still wood and brick. Commissioned for a concrete manufacturer, it showed off stucco finishes and a Spanish mission doorway that would not become fashionable for years. It stands as an early local test of construction methods that would soon spread across suburban America.

Fort Worth, TX

Cotton was king in the early-20th-century Southwest, and broker Neil P. Anderson helped make Fort Worth a hub of the inland cotton trade. His firm commissioned the prominent architects Sanguinet & Staats to design this "Cotton Exchange," completed in 1921 with skylit top-floor showrooms where buyers could inspect samples in natural light. Home to leading local businesses, the Exchange closed in 1939, though the Anderson family held the building until 1963.

Dallas, TX

In 1907 Herbert Marcus, Sr., his sister Carrie Marcus Neiman, and her husband A. L. Neiman launched Neiman-Marcus, a luxury retailer that would make Dallas synonymous with high-end American fashion. After fire destroyed the original store in 1913, this new building rose in its place, and from it flowed retail innovations—in service, marketing, and merchandising—that rippled out to stores and manufacturers nationwide. Under Herbert Marcus, the firm also became a leader in Dallas philanthropy and civic life.

Apollo, PA

This marker honors Nellie Bly, one of America's boldest early investigative reporters, who spent part of her childhood in this corner of western Pennsylvania. Writing for papers in Pittsburgh and New York in the Gilded Age, she went undercover to expose the mistreatment of the poor and the institutionalized, turning firsthand experience into front-page reform journalism. In 1889–90 she captured the nation's imagination by racing around the world in a record 72 days, a feat inspired by Jules Verne's famous novel.

Washington Township, PA · est. 1948

On a farm just west of here, worked by John Gilkey between 1798 and 1826 with the help of his brother James, a new and prized variety of potato took root. Known as the Neshannock — and also called the Mercer or Gilkey — it became one of the most widely grown and admired potatoes of early nineteenth-century America, praised for its quality on tables across the young nation. It was a homegrown agricultural success story born on the western Pennsylvania frontier.

Ely, NV

To move copper ore out of the mines west of Ely, Mark Requa's Nevada Consolidated Copper Company laid 150 miles of track to the Southern Pacific line in 1905-06, feeding a smelter at McGill by way of a long trestle later rebuilt as an earthen fill. For decades the line carried not just ore but passengers and a “school train” ferrying McGill children to Ely High School until 1941. When the copper mines closed in 1983 the railroad stopped, but its East Ely shops survive as a National Historic Landmark District and host live steam rides at a railway museum.

Carson City, NV

Completed in 1871, Nevada's Victorian-era Capitol was raised from sandstone quarried by Carson City's founder, Abe Curry. An octagonal annex followed in 1907 and the north and south wings in 1915. Its elegant interior boasts Alaskan marble walls and French crystal windows, a statehouse built to befit a young silver state.

Lyon County, NV

In July 1849, Abner Blackburn, a former member of the Mormon Battalion, made what is regarded as the first gold discovery in present-day Nevada near this spot, followed by William Prouse's find up Gold Canyon in 1850. Convinced California's riches were greater, most emigrants pressed on, but by 1851 some 200 placer miners—among them James "Old Virginny" Finney—were working the canyon. Their continuous presence at Gold Canyon's mouth made Dayton Nevada's first non-Native settlement.

Clark County, NV

As outdoor recreation gained popularity in the 1920s, Nevadans pressed the legislature to set aside public lands, and a 1931 federal land exchange laid the groundwork. In 1934 the state dedicated Valley of Fire as its first state park, followed a year later by Beaver Dam, Cathedral Gorge, and Kershaw-Ryan. Civilian Conservation Corps crews, directed by Thomas W. Miller of Reno, built much of the early infrastructure, and by 2015 Valley of Fire had grown fourfold into an internationally renowned scenic and archaeological preserve.

Eureka County, NV

In 1864 prospectors from Austin, Nevada found silver-lead ore on Prospect Peak, launching the Eureka Mining District, which by 1878 supported a population over 9,000 and ranked as Nevada's second-richest producer after the Comstock. Its peak came between 1870 and 1890 before shifting markets closed most mines. The nearby Fad Shaft—sunk from the 1940s toward ore believed to lie 2,500 feet down—was halted by flooding just 35 feet short, becoming the district's last, ore-less underground venture, while modern heap-leach operations later revived gold recovery from once-worthless rock.

New Braunfels, TX

German immigrants August Tolle and Dr. Theodor Koester built a large two-story cedar-timber building in 1864, and in 1868 it became the New Braunfels Woolen Mill, drawing on Comal River water for steam power. The successful mill eventually closed for lack of a protected trademark, and in 1901 the Popp family converted it into the town's first steam laundry, which ran until a 1934 fire. Only the old bell, rock foundation, and part of the chimney remain.

New Braunfels, TX

This land had long been home to Karankawa, Lipan Apache, Tonkawa, and Waco peoples when the Society for the Protection of German Immigrants sent thousands of colonists to Texas in the mid-1840s. Led by Prince Carl of Solms-Braunfels, several hundred founded New Braunfels on Good Friday, 1845, on land bought from the Garza family and parceled out by lottery. By 1850 it ranked among the largest cities in Texas, humming with craftsmen, mills, breweries, and kilns.

New Caney, TX

Permanent settlement of the New Caney area began in the 1860s, first taking the name Presswood for a pioneer cattle-raising family, soon joined by the farming and cotton-ginning Robinsons. When the Houston, East and West Texas Railway arrived in the 1870s, the community became a livestock shipping point known as Caney Station, and in 1882 a new post office adopted the name New Caney. As East Texas timber boomed, the town shipped out mining props cut to shore up tunnel walls.

Portsmouth, NH

When the United States entered the Great War in 1917, New Hampshire sent thousands of its young men into the trenches of France and onto the decks of a wartime navy, and roughly 700 of them never came home. This monument in Portsmouth — long a Navy town anchored by the historic Portsmouth Naval Shipyard — was raised by a grateful state to honor everyone who served between America's 1917 entry and the peace that followed in 1919. It belongs to the wave of memorials that communities across the country built in the 1920s and 1930s to fix the war's sacrifice in bronze and granite before living memory faded.

Stonington, CT

This bell once rang from Locomotive No. 3249 of the New York, New Haven and Hartford Railroad — the mighty "New Haven" line that knit together southern New England and the New York–Boston corridor. In the age of steam, a locomotive's bell warned crossings and yards and became one of the most familiar sounds of American travel. Preserved here, it is a tangible fragment of the railroad that shaped this coast.

New London, TX

On the afternoon of March 18, 1937, natural gas that had accumulated undetected beneath the New London Junior-Senior High School ignited, leveling the building and killing hundreds of students and teachers in one of the deadliest school disasters in American history. The final toll reached 311. Because the gas was odorless, no one had smelled the danger—prompting the Texas Legislature within weeks to mandate that a warning odor be added to natural gas.

Portland, OR

These cast-iron columns once fronted Portland's New Market Block, built in 1872 during the era when prefabricated iron architecture gave booming American cities their ornate commercial facades. When the block's north wing was demolished in 1956, preservationists salvaged the columns, and they were later restored as a standing colonnade. The surviving ironwork is a rare relic of Portland's Victorian-era streetscape.

Klamath County, OR

New Pokegama existed only from 1903 to 1909 as the end of the line for the Klamath Lake Railroad running up from Thrall. Here freight and passengers were transferred to wagons for the overland haul into Klamath Falls, making the little settlement a busy transfer point in south-central Oregon's timber and travel economy. When the rails pushed on, the town's brief purpose ended, and it faded — a marker placed by the Klamath County Historical Society in 1976 keeps its short life on record.

Morgan's Point, TX

At the junction of Buffalo Bayou and San Jacinto Bay, Philadelphia-born Colonel James Morgan bought 1,600 acres in 1835 and laid out New Washington, working as merchant, land agent, and civic leader. Mexican troops burned the town during the Texas Revolution while Morgan served as a colonel, but it was rebuilt and flourished until nearby Houston outgrew it. Morgan's 1850s dream of a navigable channel along Buffalo Bayou was realized in 1876 when steamship magnate Charles Morgan dredged the Houston Ship Channel; the town, now Morgan's Point, was incorporated in 1949.

New York, NY

Along Manhattan's Hudson shoreline, the New York Central Railroad's 69th Street Transfer Bridge solved a problem that defined the age of rail: how to move loaded freight cars across water when no rail bridge spanned the Hudson. Cars were rolled onto floats and barges here and ferried to connecting lines, knitting the island's industry into the national network. Placed on the National Register of Historic Places in 2003, its surviving ironwork is a rare relic of a vanished waterfront economy.

Thurber, TX

This hilltop neighborhood took shape after 1917, when the Texas and Pacific Coal Company followed W. K. Gordon's Ranger oilfield strike into the petroleum business and renamed itself the Texas Pacific Coal and Oil Company. To house staff transferred from New York for the new oil division, the firm built thirty-one homes here on what became New York Hill, reached by brick steps and sidewalks climbing from town. When the company town of Thurber was dismantled in the 1930s, the buildings came down, leaving only traces on the slope.

New York, NY

New York Life Insurance Company is one of America's oldest and largest mutual insurers, its Manhattan headquarters a fixture of the nation's financial life since the 19th century. On Memorial Day, May 30, 1946, the company's own American Legion chapter — NYLIC Post 503 — dedicated this memorial to the employees who had left their desks to serve in the armed forces in wartime, most recently the millions of Americans just home from the Second World War. Corporate honor rolls like this bloomed across the country after both World Wars, as businesses reckoned with how many of their own had gone to fight.

Town of Hunter, NY

In 1885 New York set aside its wild Adirondack and Catskill lands as a Forest Preserve, and in 1894 wrote a remarkable promise into the state constitution: these woods would be kept "forever wild." This tablet, placed in 1985 amid the Catskill peaks of Greene County, marks a full century of that pledge. It was one of the boldest conservation experiments in the nation—an era when Americans were only beginning to wonder whether the forests they were rapidly cutting might not be endless after all.