Awaiting Their Turn at the Cotton Gin, Greenville, Texas

The Columbia Ice Fields--Banff Jasper Area

Shipping Coal, Coal Breaker in Background, Ashley, Pa.

General View of Ovens -- Loading Coke into the Cars, Pennsylvania.

Rhodora canadense, White Mountain National Forest, New Hampshire, May 21, 1953

Teaching

Filling Shell with Nitro-Glycerine

Tarn with Cotton Grass, Fjordarheidi, Road to Seydisfjordur, Iceland, July 29, 1972

Baneberry, Pink Leaves and Aspen Trunks, Aspen, Colorado, October 3, 1951

Houses and Harbor, Stonington, Maine, August 21, 1974

Lobster Pot Buoys, Yeaton Cove, Maine, August 17, 1974

Houses and Harbor, Stonington, Maine, August 27, 1974

Tidal Marsh, McKinley, Mount Desert Island, Maine, August 4, 1965

Tidal Marsh, Mount Desert Island, Maine

Blue Reflections, Stream and Wet Wall, Willow Canyon, Utah, August 12, 1971

Eroded Tabular Iceberg, Grandidier Channel, Antarctica, March 1976

Grandidier Channel, Fog Blocking Sun on Mountains, Antarctica, March 1976

Adélie Penguins, Humble Island, Antarctica, February 1976

Adélie Penguins, Humble Island, Arthur Harbor, Antarctica, February 1976

Sun Lit Clouds Above Grandidier Channel, Antarctic Peninsula, Antarctica, March 1976