Redbud Tree in Bottom Land, Red River Gorge, Kentucky, April 17, 1968

Trees at Foot of Sandstone Cliff, Gray's Arch Trail, Red River Gorge, Kentucky, April 18, 1968

Volcanic Rubble, Fossardalur, Iceland, August 12, 1972

Dogwood and Oak Trees, Daniel Boone National Forest, Red River Gorge, Kentucky, April 18, 1968

Stern of Boat and Flowers, Great Spruce Head Island, Maine, August 8, 1954

Fungus on Log, Great Spruce Head Island, Maine, July 25, 1949

Steam Vent, Landmannalaugar, Iceland, June 29, 1972

Pinks on Cinder Slope, Back Road to Landmannalaugar, Iceland, July 4, 1972

Lichen on Round Stones near Flaajokull, South Coast, Iceland, July 31, 1972

Sandstone Cliff, Detail, Double Arch Trail, Red River Gorge, Kentucky, April 18, 1968

Rhododendron and Small Brook, Swift Camp Creek, Red River Gorge, Kentucky, April 19, 1968

Sumac, Great Spruce Head Island, Maine, August 1, 1954

Fallen Columns in Front of Temple of Zeus, Olympia, Greece, April 14, 1967

Lichen on Gray Rock, Great Spruce Head Island, Maine, July 1954

Grass and Maianthemum Leaves, Great Spruce Head Island, Maine, June 17, 1969

Stump and Spruce Seedlings, Great Spruce Head Island, Maine, June 21, 1968

Violets and Strawberries, Great Spruce Head Island, Maine, June 2, 1969

Star Flower, Great Spruce Head Island, Maine, June 8, 1969

Spruce Trees and Bay Bushes, Great Spruce Head Island, Maine, July 6, 1968

Sunrise, Great Spruce Head Island, Maine, July 27, 1963