The short version The archive turns up 265 records, most of them around 1950s and Grand Canyon. 125 are confidently dated; the other 140 are educated guesses — about as precise as it sounds. 264 are free to use; 1 is restricted.
Talus Slope Through Aspen and Conifer, Rocky Mountains, 1950s
1950–1959 · Rocky Mountains, western United States
Eroded Clay Badlands with Volcanic Boulder Field, American West, 1950s
1950–1959 · American West badlands
Hillside Vista Framed by Trees, Central Italy, 1950s
1950–1959 · Central Italy (hill country, possibly Tuscany, Umbria, or the Marche)
Banded Badlands Overlook, American West, 1950s
1950–1959 · American West badlands region
Autumn Drive on a Gravel Road, Rural America, 1950s
1950–1959
Tilted Rock Wall Above the Timberline, Glacier National Park, 1950s
1950–1959 · Glacier National Park, Montana
Snow-Capped Foothill and Ranch Fence, Colorado Front Range, 1950s
1950–1959 · Colorado Front Range foothills
Yellow Sand Verbena on a Pacific Dune, with Discarded Cigarette, 1950s
1950–1959 · Pacific coast dune, United States
Rocky Shoreline and Breaking Surf, Pacific Coast, 1950s
1950–1959 · Central California coast
Surf Breaking on Granite Ledge, New England Coast, 1950s
1950–1959 · New England coast
Desert Mountain Notch, American Southwest, 1950s
1950–1959 · American Southwest
A Hillside Spring Breaking Through Moss, 1950s
1950–1959
Saguaro Desert Roadside View, Southern Arizona, 1950s
1950–1959 · Southern Arizona, Sonoran Desert
Topiary Parterre of an English Country House Garden, 1950s
1950–1959 · England
Desert Peak, American Southwest, 1950s Kodachrome Slide
1950–1959 · American Southwest desert
Carpet-Bedding Spiral in a Formal Garden, 1950s
1950–1959
Piñon-Juniper Overlook, Southwestern High Desert, 1950s
1950–1959 · Southwestern United States (high desert)
Millpond With Ducks and Utility Pole, Suburban America, 1950s
1950–1959
Wildflowers on Rocky Ground, 1950s
1950–1959
Arched Bridge over Pastoral Stream, 1950s
1950–1959
Lakeside Park, 1950s
1950–1959
Mountain Pass Highway, Pacific Northwest, 1950s
1950–1959
Hawk on Dead Aspen, Mountain Valley — American West, 1950s
1950–1959
Wind-Sculpted Cypress Snag Beside Coastal Road, California, 1950s
1950–1959
Rocky Mountain River Canyon with Figures, Canadian Rockies, 1950s
1950–1959
Urban Lake and Parkland, East Asia, 1950s
1950–1959
Horseshoe Falls from Prospect Point, Niagara Falls, 1950s
1950–1959
Wind-Sculpted Cypress Snag and 1950s American Sedan, Coastal Road
1950–1959
Horseshoe Falls from Prospect Point, Niagara Falls, 1950s
1950–1959
Tower Fall, Yellowstone National Park, 1950s
1950–1959
Waterfall Over Layered Sandstone Gorge, 1950s
1950–1959
Walled Formal Garden with Perennial Borders, 1950s
1950–1959
Yellowstone Lake and Village from Overlook, Wyoming, 1950s
1950–1959
Mountain Lake Vista from Forested Overlook, Rocky Mountains, 1950s
1950–1959
High-Altitude Summit View, Rocky Mountain West, 1950s
1950–1959
Wildflower Colonization on Limestone Slope, 1950s
1950–1959
Rock Formation in Coniferous Forest, 1950s
1950–1959
Roadcut or Quarry Face, 1950s
1950–1959
Industrial landscape from a hillside elevation, 1950s
1950–1959
Great Lakes Shoreline from the Water, 1950s
1950–1959
Mountain Valley with Clouds, 1950s
1950–1959
Fallen Timber in Forest Clearing, 1950s
1950–1959
Mountain Stream with Rock Formations, 1950s
1950–1959
Forested Ridge, 1950s
1950–1959
Sedge in Bloom, 1950s
1950–1959
Limestone Outcrop with Abandoned Geological Hammer, 1950s
1950–1959
Alpine Canyon, Winter, 1950s
1950–1959
Mountain Pass Road, Alpine Forest, 1950s
1950–1959
certain
inferred
low confidence