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