Eliot Porter, Hubbard Woods, Illinois, to Henry Allen Moe, John Simon Guggenheim Memorial Foundation. January 2, 1942.

John Macrae, III, President, E. P. Dutton & Co., Inc., New York, New York, to Eliot Porter. August 21, 1973.

Elvis J. Stahr, President, National Audubon Society, New York, New York, to Eliot Porter. December 12, 1974.

Les Line, Editor, Audubon, New York, New York, to Hugh Nash, Editor, Friends of the Earth. January 25, 1971.

Wendell A. Morder, Professor of Atmospheric Science, University of Miami, Miami, Florida, to Eliot Porter. August 23, 1971.

Elvis J. Stahr, President, National Audubon Society, New York, New York, to Eliot Porter. January 29, 1975.

Daniel E. Pike, Rocky Mountain Field Representative, The Nature Conservancy, Denver, Colorado, to Eliot Porter. February 9, 1977.

David H. McAlpin, Princeton, New Jersey, to James Oliver, Director, New York Aquarium. October 17, 1979.

Fordyce Staempfli, GEO Gruner & Jarh USA, Inc., New York, New York, to Eliot Porter. July 15, 1980.

Eliot Porter, Winnetka, Illinois, to Henry Allen Moe, Secretary, John Simon Guggenheim Memorial Foundation. December 28, 1945.

Kenneth D. Morrison, Editor, Audubon Magazine, New York, New York, to Eliot Porter. April 8, 1954.

Anne D. Kobor, Illustrations Editor, National Geographic Society, Washington, D.C., to Eliot Porter. September 23, 1975.

John Macrae, III, President, E. P. Dutton, New York, New York, to Eliot Porter. September 22, 1978.

Eliot Porter, Santa Fe, New Mexico, to Apparatus and Parts Service, Eastman Kodak Company. August 20, 1960.

Eugene A. Schnell, Exhibits Division, Information Center Service, United States Information Agency, Washington, D. C., to Laura Gilpin. September 2, 1959.

C. R. Junceau, Artists and Writers Press, Inc., New York, New York, to Laura Gilpin. September 17, 1959.

Guy Neff, Book Editor, Meredith Publishing Company, Des Moines, Iowa, to Laura Gilpin. February 9, 1959.

Laura Gilpin, Santa Fe, New Mexico, to Joseph Trautwein, Artists and Writers Press, Inc. November 4, 1959.

Savoie Lottinville, University of Oklahoma Press, Norman, Oklahoma, to Laura Gilpin. October 1, 1959.

Mitchell Wilder, Chouinard Institute, Los Angeles, California, to Laura Gilpin. November, 1959.