Senecio and Red Top Grass, Dirego, Maine, August 14, 1954

Cobwebs and Grass, Great Spruce Head Island, Maine, August 1954

Cinders on Glacier near Skogar, Iceland, July 5, 1972

Close-up, Dettifoss, Iceland, July 24, 1972

Black Sand Ripples, Road to Askja, Iceland, July 22, 1972

Crevasses with River Behind, Fláajökull, South Coast of Iceland, July 31, 1972

Glacial Lake with Volcanic Peak, Fjnllsarlon, South Coast, Iceland, August 1, 1972

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

Indian Pipes, Great Spruce Head Island, Maine, August 1, 1954

Wet Leaves in Rain, Great Spruce Head Island, Maine, July 1954

Ferns and Rocks, Maine, August 1942

Lichen and Birch Branch, Dirego Island, Maine, July 11, 1963

Old Spruce Tree, Great Spruce Head Island, Maine, July 15, 1963

Spruce Trees in Fog, Great Spruce Head Island, Maine, August 20, 1954

Fungus and Grass, Great Spruce Head Island, Maine, July 8, 1964

Wright Lower Glacier, Wright Valley, Antarctica, December 12, 1975

Wright Lower Glacier, Wright Valley, Antarctica, December 12, 1975

Lower Taylor Valley, Commonwealth Glacier, Antarctica

Lobster Pots and Grass, Stonington, Maine, July 11, 1964

Lichened Rocks, Sloop Island, Maine, July 26, 1968