Roots and Eroded Sandstone, Gray's Arch Trail, Red River Gorge, Kentucky, April 18, 1968

Rock Bridge, Swift Camp Creek, Red River Gorge, Kentucky, April 19, 1968

Lava Lizard, Academy Bay, Santa Cruz Island, Galápagos Islands, April 26, 1966

Pines on Old Foundations of Hotel, Epidaurus, Greece, April 7, 1967

Dead Leaves, Various, Swift Camp Creek, Red River Gorge, Kentucky, April 19, 1968

Clam Shells Left by Crows, Great Spruce Head Island, Maine, July 17, 1949

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

Fungi on Birch Trunk, Great Spruce Head Island, Maine, June 15, 1969

Orange and Gray Lichen, Sugar Loaf, Barred Islands, Maine, June 23, 1969

Pot Buoy and Mussel Shells, Great Spruce Head Island, Maine, June 12, 1968

Sea Urchins Left by Crows, Great Spruce Head Island, Maine, July 24, 1968

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

Lichen and Moss on Gray Boulder, Great Spruce Head Island, Maine, June 26, 1969

Branches of Dead Spruce, Great Spruce Head Island, Maine, July 3, 1964

Grass and Rock at Sunrise, Great Spruce Head Island, Maine, July 31, 1963

Young Spruces and Old Spruce, Great Spruce Head Island, Maine, July 25, 1963

Sea Wrack and Tidal Rocks, Bennet Cove, Mount Desert Island, Maine, August 5, 1965

Ribbon Kelp, Eagle Island, Maine, July 22, 1965

Rocks and Shore in Fog, Great Spruce Head Island, Maine, July 15, 1964

Blueberries and Lichen, Great Spruce Head Island, Maine, July 19, 1964