Bare Aspens, Pacheco Canyon, New Mexico, June 1, 1957

Grey Allison Hoyt Dunlap

Sponge Raised by Anchor Ice, Black Island, McMurdo Sound, Antarctica, December 17, 1975

Sunset Clouds, Chiricahua Mountains, Arizona, June 1959

Cliff, Moonlight Creek, San Juan River, Utah, May 23, 1962

Twenty Mule Team Canyon, Death Valley, California, May 4, 1974

Grass in Snow, Shelburne Pass, Vermont, 1957

Grass in Snow, Shelburne Pass, Vermont

Sculptured Rock, near House Rock Rapids, Marble Canyon, Arizona, June 13, 1967

Blueberry Leaves and Maple Trunks, Passaconaway, New Hampshire, October 7, 1952

Glacier-scratched Rock, Great Spruce Head Island, Maine, July 21, 1971

Trees and Pond, near Sherborn, Massachusetts, April 1957

Erratic Boulders and Rugosa Roses, Chain Links, Maine, June 19, 1982

Deposits of Volcanic Ash, Tres Virgenes Canyon, Baja California, Mexico, March 2, 1964

View Across Colorado River, Lava Canyon, Grand Canyon, Arizona, June 16, 1967

River with Shadow on Canyon Wall, Mile 122, Grand Canyon, Arizona, June 22, 1967

Gerlache Strait to Neumayer Passage from Research Vessel "Hero", Antarctica, February 24, 1976

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

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

View Down River with Boulder, Granite Rapids, Grand Canyon, Arizona, June 19, 1967