Audubon's Warbler, Male, Santa Fe Basin, New Mexico, June 26, 1950

Red-faced Warbler, Long Park, Chiricahua Mountains, Arizona, June 6, 1959

Red-faced Warblers, Long Park, Chiricahua Mountains, Arizona, June 7, 1959

Red-faced Warblers, Long Park, Chiricahua Mountains, Arizona, June 7, 1959

Bay-breasted Warblers, Ely, Minnesota, July 6, 1962

Orange-crowned Warbler

Rocky Mountain Orange-crowned Warbler, Aspen Basin, Sangre de Cristo Mountains, New Mexico, July 13, 1959

Double Beaches, Great Spruce Head Island, Maine, June 7, 1949

Water Chute, Explorer's Canyon, Lake Powell, Utah, September 6, 1968

Pool with Reflections, Zion National Park, Utah, May 9, 1969

Spring Flowers, Great Spruce Head Island, Maine, 1938

Spring Flowers, Great Spruce Head Island, Maine, 1938

Ferns and Rocks, Great Spruce Head Island, Maine, August 1940

Thomas Warren, Stonington, Maine, 1938

Pine and Talus, Beartooth Highway, Montana, August 26, 1979

Roaring Mountain, Yellowstone National Park, Wyoming, August 28, 1979

Lichen on Grey Wood, Yellowstone National Park, Wyoming, August 12, 1952

Burrowing Owl, Kissimmee Prairie, Florida, May 4, 1954

Pine Cones and Juniper, Bench Ranch, Fishtail, Montana, August 19, 1979

Indian Paintbrush, Canyonlands National Park, Utah, May 3, 1973