The short version The archive turns up 107 records, most of them around Grand Canyon. 2 are confidently dated; the other 105 are educated guesses — about as precise as it sounds. All are free to use.
Alpine Valley Resort or Mountain Lodge, Early Color Film, circa 1950s
1948–1958
Aerial View of Bay and Waterfront, Mid-20th Century
1948–1965
German River Town at Dusk, circa 1950s
1948–1958
Mountain Pass Through Alpine Forest, Mid-20th Century Kodachrome
1945–1965
Limestone Quarry or Strip Mine, Mid-20th Century American West
1940–1970
Suburban Waterfront, Midwest Lake City, circa 1950s
1945–1960
Industrial Waterfront, Florida, 1940s-1950s
1940–1955
Mediterranean Coastal Inlet with White Limestone Cliffs, circa 1950s
1945–1960
Tourists at a Mountain Gorge with Cascading Waterfall, Early Color Photography
1940–1955
Manhattan at Night, circa 1940s-1950s
1940–1955
Rural Homestead with Crepe Myrtles, American South, circa 1940s-1950s
1940–1955
Formal Garden with Italian Cypress and Weeping Trees
1940–1960
Thatched House with Stream and Ivy, Britain, circa 1940s–1950s
1940–1955
Pine Forest and Stone Tower, Mid-20th Century American Landscape
1940–1960
Birch trees and lake, Canadian Shield region, autumn 1940s–1950s
1945–1955
Flower Show Display Garden, Mid-20th Century
1945–1965
Rural riverside homestead, American Midwest, mid-20th century
1940–1960
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
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
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
certain
inferred
low confidence