The short version The archive turns up 25 records. 3 are confidently dated; the other 22 are educated guesses — about as precise as it sounds. All are free to use.
Mountain Monastery Amid Dense Forest, Balkans, 1960s
1960–1969
Mediterranean Coastal Town from the Water, French Riviera, 1960s
1960–1969
Mineral-Stained Geothermal Pool Edge, Yellowstone, 1960s
1960–1969
Rolling Farmland Valley with Collapsed Outbuilding, Eastern Canada, 1960s
1960–1969
Modernist Dining Room, Chromogenic Slide, circa 1960s
1960–1969
Alpine Botanizing, High Mountain Meadow, 1960s
1960–1969
Cenote or Spring-Fed Pool, Yucatan, 1960s
1960–1969
Coastal Headlands, Aerial View, circa 1960s
1960–1975
Mountain Valley at Dusk, circa 1960s
1960–1975
Coastal Town and Tidal Flats, Maritime Canada, 1960s
1960–1968
Tidal Flat Community, Maritime Canada, circa 1970s
1968–1982
Cenote or Subtropical Spring, Aerial View, circa 1960s-1970s
1960–1975
Florida Residential Garden, circa 1970s
1965–1980
Water-skier on inland lake with forested hillside, circa 1960s
1960–1975
Nighttime aerial view of a North American city, circa 1960s-1970s
1960–1975
Basset Hound in Backyard, circa 1970s
1968–1978
Forested River Valley with Pasture, Appalachian Region, 1970s
1968–1978
Willamette Valley Farmland, Oregon, 1960s
1960–1968
Tidal Flats at Sunset, c. 1970s
1965–1985
Coniferous River Corridor, Northern Forest, circa 1970s
1965–1980
Roseate Spoonbill, Shallow Water Habitat
1960–1985
Palm Trees Against Sky, Tropical Location
1960–1975
Infrared Landscape with Scattered Trees, 1960s-1970s
1960–1975
Deep-sea floor with crustaceans, deep ocean research
1960–1985
Golden Gate Bridge at Sunset from San Francisco Bay Shore, ca. 1960s–70s
1960–1978
certain
inferred
low confidence