The short version The archive turns up 141 records, most of them around Grand Canyon. 2 are confidently dated; the other 139 are educated guesses — about as precise as it sounds. All are free to use.
Sandy bottom creek with winter trees, mid-20th century 1945–1965 Captive Lion, Mid-20th Century Zoo or Menagerie 1940–1970 Azalea Garden in Pine Forest, American South, circa 1940s–1950s 1940–1955 Waterfall in Dense Forest, Kodachrome Slide, circa 1940s-1950s 1940–1955 Mountain Lake with Passenger Liner, circa 1950s 1945–1965 Lava Field with Birch Forest, Northern Landscape, Mid-20th Century 1945–1965 Neoclassical Building Approached Through Overgrown Garden, Mid-20th Century 1945–1965 Will Rogers Shrine of the Sun Dedication or Event, 1940s 1940–1949 Aviario con Flamencos y Garzas, Zoo o Parque Estadounidense, circa 1950s 1948–1962 Desarrollo de viviendas de posguerra en construcción, circa 1950 1948–1956 Autumn Riverbank with Dead Log, ca. 1940s-1950s 1940–1955 Fleet of Orange National Park Tour Buses, Pacific Northwest Mountains, c.1950s 1948–1962 Coastal lagoon with beached boat and mangrove forest, Southeast Asia, circa 1950 1945–1965 Snow-Patched Mountain Range with Forested Valley, circa 1950s 1945–1965 Waterfall in Conifer Forest, Pacific Northwest, circa 1950s 1945–1965 Forest Canyon with Stream, Early Color Photography 1945–1965 Estate Garden with Formal Borders, Mid-20th Century 1945–1975 Institutional flower bed display, mid-20th century 1945–1965 Well Shelter in Rural Orchard, Mid-20th Century 1945–1970 Mangrove Channel, Hand-Tinted Kodachrome, circa 1940s 1945–1955 Mountain Valley Landscape, Mid-20th Century 1940–1970 Tropical River Valley with Dense Jungle Canopy, Southeast Asia, mid-20th century 1945–1970 Desert Wildflowers and Cacti, American Southwest 1940–1949 Alpine Peaks from Aircraft, mid-20th Century 1945–1965 Atoll at Horizon, Pacific, 1940s-1950s 1940–1955 Bat roosting under eave, mid-20th century 1940–1965 Swimmers in Towed Rope Line, Lake or Sound, 1950s 1945–1965 Forest Canopy Study, circa 1950s 1945–1965 Memorial Plaque, Coastal Location, mid-20th century 1940–1970 Wooded Waterside Clearing, Mid-20th Century 1945–1970 Hydroelectric Dam Spillway in Operation, Mid-20th Century 1940–1965 Civic Monument and Domed Building from Riverbank, Mid-20th Century 1945–1965 Chalk Cliff Face with Coastal Vegetation, British Channel Coast 1945–1975 Alpine Avalanche Research Installation, Mid-20th Century 1945–1959 Aerial View of Shallow Reef or Sandbar, Tropical Waters 1940–1970 Aerial View of Volcanic Island with Steam Plumes, Mid-20th Century 1940–1960 Mountain Valley in Mist, Early Color Photography 1940–1960 Desert Wildflower, High Desert Plateau Region c. 1949 Open-Pit Mine Workings and Waste Dumps, Western North America, 1940s 1940–1949 Arctic Research Station, Boreal Forest in Winter Snow 1945–1965 Mountain Lake at Dusk, Mid-20th Century 1940–1965 Mountain stream in winter, Pacific Northwest evergreen forest c. 1940 River at Dusk, American South, 1940s–1950s 1940–1955 Rural Landscape at Sunset with Power Lines, circa 1940s 1945–1949 Quarry or Excavation Site with Workers, mid-20th Century 1940–1965
certain inferred low confidence