Cottonwood Trees and Sand Dunes, Great Sand Dunes National Monument, Colorado, May 31, 1975

Willows Beside Creek, Willow Creek Pass, Colorado, May 28, 1975

Mangrove, West Lake, Everglades National Park, Florida, February 20, 1974

Mangrove Roots, West Lake, Everglades National Park, Florida, February 20, 1974

Mangrove Roots, West Lake, Everglades National Park, Florida, February 24, 1974

Mangrove Roots, West Lake, Everglades National Park, Florida, February 24, 1974

Cypress Trunks and Duckweed, Cypress Lodge, Punta Gorda, Florida, January 30, 1974

Mangrove at Limit of Growth, Everglades National Park, Florida, February 24, 1974

Tree Cactus and Bay, Plazas Island, Galápagos Islands, March 6, 1966

Cerro Colorado, Santa Cruz Off Plazas Island, Galápagos Islands, March 7, 1966

Land Iguana, Plazas Island, Galápagos Islands, March 6, 1966

Dead Booby with Lava Lizards, Daphne Major, Galápagos Islands, March 8, 1966

Cypress Slough, Cypress Lodge, Punta Gorda, Florida, January 31, 1974

Ground Cover and Cordon Rock, Plazas Island, Galápagos Islands, March 7, 1966

Frigate Bird Nest and Egg, Daphne Major, Galápagos Islands, March 8, 1966

Cypress Slough, Cypress Lodge, Punta Gorda, Florida, January 31, 1974

Longleaf Pine, Detail, Cypress Lodge, Punta Gorda, Florida, February 1, 1974

Paurotis Palm, Everglades National Park, Florida, February 19, 1974

Salicornia, Everglades National Park, Flamingo, Florida, February 22, 1974

Mangrove Roots, [Bear Lake Trail], West Lake, Everglades National Park, Florida, February 24, 1974