Rocks, Lichen, Vegetation, South Plazas Island, Galápagos Islands, June 6, 1966

Galápagos Penguins, Punta Espinosa, Fernandina Island, Galápagos Islands, April 3, 1966

Swallowtail Gull, Punta Pitt, San Cristóbal Island, Galápagos Islands, May 24, 1966

Starfish in Shallow Water, San Cristobal Island, Galápagos Islands, May 23, 1966

Frigate Birds, Pair at Nest, Tower Island, Galápagos Islands, March 22, 1966

Flightless Cormorant, Punta Espinosa, Fernandina Island, Galápagos Islands, April 3, 1966

Flightless Cormorants, Punta Espinosa, Fernandina Island, Galápagos Islands, April 8, 1966

Galápagos Dove, Tower Island, Galápagos Islands, March 22, 1966

Yellow-crowned Night Heron, Immature, Tower Island, Galápagos Islands, March 22, 1966

Cloud Formations, Tesuque, New Mexico, July 1977

Cloud Formations, Tesuque, New Mexico, July 1977

Sunset Clouds, Tesuque, New Mexico, July 1977

Evening Clouds, New Mexico

Brook and Leaves, Aspen, Colorado, September 28, 1951

Brook and Leaves, Aspen, Colorado, September 28, 1951

Mountain Lake, Stony Pass, [San Juan Mountains], Colorado, August 8, 1958

Aspen Forest, Aspen, Colorado, October 3, 1951

Aspen Forest, Aspen, Colorado, October 3, 1951

Rock Rubble, Engineer Pass, [Uncompahgre National Forest], Colorado, August 14, 1957

Rock Rubble, Engineer Pass, [Uncompahgre National Forest], Colorado, August 14, 1957