Gypsum Flakes, Pagoda Canyon, Utah, August 25, 1963

Muley Tank and Willows, Waterpocket Fold, Utah, August 23, 1963

Sunset Clouds and Plane, Waterpocket Fold, Utah, August 19, 1963

Narrow Pool, Waterpocket Fold, Utah, August 21, 1963

White Boulders on Bentonite, Heartnut Desert, Utah, August 29, 1963

Lava Boulders on Bentonite, Heartnut Desert, Utah, August 29, 1963

Blue-throated Hummingbird, Southwestern Research Station, Chiricahua Mountains, Arizona, May 1959

Blue-throated Hummingbird, Southwestern Research Station, Chiricahua Mountains, Arizona, May 1959

Rock Formations, San Juan River, Utah, May 1962

Pools in Aztec Creek, Glen Canyon, Utah, September 5, 1962

Red Hill, Black Boulders, Notom, Utah, August 24, 1963

Northern Parula Warbler, Male, Great Spruce Head Island, Maine, June 28, 1945

Northern Yellowthroat, Male, Great Spruce Head Island, Maine, July 20, 1945

Red-eyed Vireo, July 17, 1939

Black-throated Green Warblers, Male and Female, July 13, 1939

Black-capped Chickadee, Great Spruce Head Island, Maine, June 17, 1945

Song Sparrow's Nest, Great Spruce Head Island, Maine, June 15, 1938

White-throated Sparrow, Female, Great Spruce Head Island, Maine, July 25, 1945

White-throated Sparrow, Male, Great Spruce Head Island, Maine, June 9, 1945

Black-throated Green Warbler, Male, July 9, 1939