Trailing Arbutus, Rainbow Falls Trail, Great Smoky Mountains National Park, Tennessee, April 12, 1968

Spring Forest, Newfound Gap Road, Great Smoky Mountains National Park, Tennessee, April 23, 1968

Toad Shade Trillium, Walnut Bottom Road, Great Smoky Mountains National Park, Tennessee, April 24, 1968

Dead Chestnut, Newfound Gap Road, Great Smoky Mountains National Park, Tennessee, May 8, 1968

Hedgehog Cactus, Solitario Uplift, Big Bend Ranch, Texas, November 5, 1978

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

Detail of Acanthus Leaves, Corinthian Capital, Serapon, Ephesus, Turkey, April 3, 1971

Corner Pilaster and Drain, Library, Ephesus, Turkey, April 4, 1971

Navajo Sandstone Cliff, Mile 137, Colorado River, Utah, October 5, 1960

Navajo Sandstone Cliff, Mile 137, Colorado River, Utah, October 5, 1960

Rocks in Sand, Navajo Creek, Glen Canyon, Utah, August 27, 1961

Rocks in Sand, Navajo Creek, Glen Canyon, Utah, August 27, 1961

Pool at Music Temple, Glen Canyon, Utah, August 27, 1961

Tree and Rocks, Music Temple, Glen Canyon, Utah, September 23, 1961

Airplane View, Congaree Swamp in Flood, South Carolina, April 19, 1969

Cypress in Frenchman's Pond, Congaree, South Carolina, October 25, 1969

Congaree Swamp, South Carolina

Cypress Knees in Water, Four Hole Swamp, South Carolina, October 30, 1969

Rocks and Tidal Pool, Second Beach, Olympic Peninsula, Washington, July 26, 1975

Maple, Eagle Creek Trail, Mount Hood National Forest, Oregon, July 19, 1975