Forest Litter, Great Spruce Head Island, Maine, June 30, 1964

Daisies, Chain Links, Barred Islands, Maine, July 20, 1965

Cobwebs on Grass, Great Spruce Head Island, Maine, July 13, 1964

Lichen on Maple, Great Spruce Head Island, Maine, July 19, 1964

Consolidated Ash, Kleifarvatn, Iceland, June 21, 1972

Lichens on a Rock, Road to Laki, Iceland, July 3, 1972

Sunset Clouds, Hofn, Iceland, August 1972

Ruined Temple, Agrigento, Sicily, March 20, 1967

Agrigento, Sicily

Evening Clouds, Egilsstadhir, Iceland, July 1972

Kittiwakes, Hellnar, Snaefellsnes, Iceland, July 1972

Flowers on Temple of Zeus, Agrigento, Sicily, March 20, 1967

Tidal Pool, Isle au Haut, Maine, July 28, 1963

Yellow Fungus on Stump, Great Spruce Head Island, Maine, July 8, 1964

Star Flower and Bark, Great Spruce Head Island, Maine, June 9, 1964

Birch Tree, Great Spruce Head Island, Maine, July 7, 1964

Birch Tree, Great Spruce Head Island, Maine, July 12, 1964

Lichen on Split Rocks, Little Spruce Head Island, Maine, July 26, 1963

Lichen on Birch Bark, Great Spruce Head Island, Maine, June 25, 1964

Stained Rock, Isle au Haut, Maine, July 28, 1963