The short version The archive turns up 157 records, most of them around Grand Canyon. 11 are confidently dated; the other 146 are educated guesses — about as precise as it sounds. All are free to use.
Aspen and Conifer Forest, Grand Canyon Rim, 1948 1948 · Grand Canyon Grand Canyon Erosion Study, 1944 1944 · Grand Canyon Huerta de Cítricos con Palmeras, Años 1940, Colonia Mediterránea o Norteafricana 1940–1949 Niños en traje de vaquero en feria rural, años 1940 1940–1949 Alpine Wildflowers, años 1940 1940–1949 Garganta de pizarra con lecho rocoso estratificado, años 1940 1940–1949 Avión en vuelo, años 1940 1940–1949 Turista en la Puerta de Piedra Inca, Perú, años 1940 1940–1949 Mapa en relieve de las Hawaiian Islands, años 40 1940–1949 Scout en Uniforme de Gala, años 1940 1940–1949 Valle alpino con asentamiento disperso, años 1940 1940–1949 Ordnance Field Study, 1940s 1940–1949 Busto Azul en Sombra Perenne, Años 1940 1940–1949 Tulip Farm Display Garden, Netherlands, circa 1950s 1948–1958 Fiesta de oficina con pastel de cumpleaños, circa 1950 1948–1952 Mujer en la playa, años 1940 1940–1947 Water Skiing, Inland Lake, circa 1950s 1945–1960 Dahlias Behind Chain-Link Fence, 1950s 1945–1960 Funcionarios Forestales en un Bosque de Pinos de Hoja Larga, Florida o Sureste, Años 1940 1940–1950 Garden Party Group, British Cottage, década de 1940 1940–1950 Reunión social de iglesia, años 40 1940–1948 Cascade Range Forest Vista, Pacific Northwest, circa 1950s 1948–1958 Mujer en vestido rayado entre tulipanes, años 1940 1940–1948 Mountain Valley Through Conifer Forest, circa 1950s 1948–1958 Dos chicas con un sedán azul, años 1940 1940–1945 Picnic en la playa con niños, años 1940 1940–1948 Poste de barbería y multitud en parque de diversiones o feria, años 1950 1948–1958 Demostración del servicio de extensión para el cultivo de maíz, ca. 1950s 1948–1955 Niña con atuendo de Pascua, barrio residencial estadounidense, años 1940 1940–1946 Cala rocosa con bote amarrado y visitantes, costa irlandesa o escocesa, circa 1950s 1945–1960 Grand Canyon of the Yellowstone, Yellowstone National Park 1940–1965 Cadena montañosa cubierta de nieve con bosque en primer plano, Pacific Northwest, circa 195 1945–1960 Army Talent Show, circa 1940s 1940–1946 Niagara Falls from the Canadian Shore, 1940s–1950s 1940–1955 Picnic Party at Subtropical Gardens, circa 1950s 1945–1960 Alpine Gorge with Chapel, Central European Mountain Valley, 1950s 1948–1960 Mountain Resort Lodge with Alpine Forest, Circa 1950s 1945–1960 Mountain Road Construction, Alpine Region, circa 1950s 1945–1960 Mountain Valley Viewed from a Tunnel Window, Mid-20th Century 1945–1965 Spanish Colonial Courtyard with Bougainvillea, 1950s 1948–1955 Formal Garden Border, ca. 1940s–1950s 1940–1955 Child with Toy Drum Set, circa 1950s 1948–1958 Lakeside Pavilion Interior, Summer c. 1950s 1945–1960 Manhattan Waterfront from Bridge, Mid-20th Century 1945–1955 Mediterranean Courtyard with Blue Column and Hydrangeas, circa 1950s 1945–1965 Puerta institucional con Live Oaks, American South, mediados del siglo XX 1945–1965 Formal Garden with Massed Plantings, Mid-20th Century 1945–1965 Tourist at Classical Ruin with Evergreen Shade, 1950s 1948–1958
certain inferred low confidence