Guano-covered Rocks, Cormorant Island, Palmer Station, Antarctica, February 14, 1976

Guano-Covered Rocks, Cormorant Island, Palmer Station, Antarctica, February 14, 1976

Chinstrap Penguins Porpoising, Nelson Strait, 1976

Suess Glacier and Matterhorn from Nussbaum Riegel, Taylor Valley, Antarctica, January 7, 1976

Molting Adélie Penguins, Cormorant Island, Palmer Station, Antarctica, February 14, 1976

Volcanic Boulders, Deception Island, Antarctica, February 26, 1976

Collapsing Glacier Edge, Prospect Point, Antarctica, March 6, 1976

Reflections on Edges of River, Mile 122, Grand Canyon, Arizona, June 22, 1967

Yellow Columbine, Bear Canyon, Santa Catalina Mountains, Arizona, May 27, 1958

Jasper Veins in Boulder, 29 Mile, Marble Canyon, Arizona, June 15, 1967

Pools in Limestone Boulder, 29 Mile Rapid, Marble Canyon, Arizona, June 15, 1967

View Up River with Boulders, Granite Rapids, Grand Canyon, Arizona, June 20, 1967

View Up River with Boulders, Granite Rapids, Grand Canyon, Arizona, June 20, 1967

Sunset in Grandidier Channel from Research Vessel "Hero", Antarctica, March 7, 1976

Canyon End in Sun, Spook Canyon, Marble Canyon, Arizona, June 16, 1967

Polished Limestone, Redwall Cavern, Marble Canyon, Arizona, June 15, 1967

Down Colorado from Lava Canyon Entrance, Grand Canyon, Arizona, June 16, 1967

Paloverde, Tucson Mountain Park, Arizona, May 13, 1958

Sycamore Tree, Sabino Canyon, Arizona, April 11, 1958

Looking Down Lava Canyon, Grand Canyon, Arizona, June 16, 1967