Quarry Face with Lichen, circa 1940s 1935–1955 Winter Shelter in Deciduous Woods, Midwest, circa 1940s 1938–1948 Alkaline Creek in Sagebrush Country, American West, circa 1940s 1938–1950 Mountain Flora Study, Alpine Vegetation, circa 1940s 1935–1950 Industrial Canal with Bridge, circa 1940s 1938–1948 Swampland with Cypress Roots, American South, circa 1940s 1935–1950 Stream-worn boulders and eroded streambed, limestone country 1930–1970