Kent W. Wommack, Director of Land Protection, The Nature Conservancy, Brunswick, Maine, to Eliot Porter. June 27, 1984.

Karen Altpeter Zogg, Picture Editor, National Geographic Society, Washington, D.C., to Eliot Porter. December 14, 1979.

Leo A. Borah, Editorial Staff, National Geographic Society, Washington, D.C., to Eliot Porter. February 2, 1940.

William R. Waldman, State Director, The Nature Conservancy, Santa Fe, New Mexico, to Eliot Porter. June 9, 1988.

Eliot Porter, Santa Fe, New Mexico, to J. R. Hildebrand, National Geographic Magazine. April 30, 1940.

Kenneth R. Margolis, Director of Program Development, The Nature Conservancy International Program, Washington, D.C., to Eliot Porter. August 22, 1985.

Ashley Boren, Coordinator, Campagn for the Galapagos Islands, The Nature Conservancy International Program, Washington, D.C., to Eliot Porter. October 30, 1984.

Ashley Boren, Coordinator, Campagn for the Galapagos Islands, The Nature Conservancy International Program, Washington, D.C., to Eliot Porter. July 23, 1984.

Eliot Porter, Winnetka, Illinois, to Henry Allen Moe, John Simon Guggenheim Memorial Foundation. January 24, 1946.

Information about the American Polar Society and The Polar Times. 1978-1979.

Michael A. Luishaw, Mount Sinai Hospital, New York, New York, to Eliot Porter. January 25, 1969.

Laura Gilpin, Santa Fe, New Mexico, to Edna H. Massey, Department of the Interior Building. January 27, 1969.

Lucille Ogle, Western Printing and Lithography Company, New York, New York, to Laura Gilpin. February 26, 1964.

Robert O. Parks, Director, University Art Museum, University of New Mexico, Albuquerque, New Mexico, to Laura Gilpin. July 27, 1967.

Gordon Foster, Presentation Industries, Inc., San Gabriel, California, to Laura Gilpin. January 23, 1968.

Susan Allen, Director, Public Relations, National Cowboy Hall of Fame and Western Heritage Center, Oklahoma City, Oklahoma, to Laura Gilpin. May 13, 1969.

Karen Nangle, Picture Research, Western Printing and Lithographing Company, New York, New York, to Laura Gilpin. April 10, 1963.

Robert B. Stewart, High School Social Studies, Scott, Foreman and Company, Chicago, Illinois, to Laura Gilpin. January 21, 1963.

Juliette C. de Baca, New Mexico Magazine, Santa Fe, New Mexico, to Laura Gilpin. November 9, 1964.

Lilla Hind, Western Printing and Lithographing Company, New York, New York, to Laura Gilpin. June 4, 1963.