Avalanche Lilies, Mount Rainier, Washington, August 2, 1975

Fog in Valley, Chisos Mountains, Big Bend National Park, Texas, November 4, 1978

Fog in Valley, Chisos Mountains, Big Bend National Park, Texas, November 4, 1978

Agora and Poplars, Aphrodisias, Turkey, April 5, 1971

North of Taos, New Mexico, November 1940

North of Taos, New Mexico, November 1940

Truchas, New Mexico, November 1940

Truchas, New Mexico, November 1940

Madrid, New Mexico, November 1940

Shiprock, New Mexico, October 1940

Chama River, New Mexico, October 1940

Chama River, New Mexico, October 1940

Fracture Weathering, Glen Canyon, Utah, September 1961

Small Streams, Rough Spring, Big Bend National Park, Texas, November 4, 1978

Lechuguilla and Wet Rocks, Rough Spring, Big Bend National Park, Texas, November 4, 1978

Lichen, Glen Canyon, Utah, August 24, 1961

Terraces in Brook, Aztec Creek, Forbidden Canyon, Utah, August 28, 1961

Pine Tree on Altar of Zeus, Pergamon, Turkey, April 2, 1971

General View of Theater, Pergamon, Turkey, April 2, 1971

Willows, Glen Canyon, August 24, 1961