Frederick Morgan, Editor, The Hudson Review, New York, New York, to Eliot Porter. March 2, 1971.

Harold E. Edgerton, Massachusetts Institute of Technology, Cambridge, Massachusetts, to Eliot Porter. January 20, 1941.

J. P. Myers, Director, The Academy of Natural Sciences, Philadelphia, Pennsylvania, to Eliot Porter. February 17, 1982.

John May, Editorial Director, Greenpeace Books, Sussex, England, to Eliot Porter. September 30, 1987.

J. P. Myers, Director, Visual Resources for Ornithology, Philadelphia, Pennsylvania, to Eliot Porter. July 19, 1983.

Clarence H. White, Clarence H. White School of Photography, New York, New York, to Laura Gilpin. May 15, 1924.

Laura Gilpin, Colorado Springs, Colorado, to The Council of Girl Scouts, Colorado Springs. n.d.

Brenda Putnam, Firenze, Italia, to Laura Gilpin. January 10, 1927.

R. A. Devlin, Chief Clerk, Mesa Verde National Park, Mancos, Colorado, to Laura Gilpin. September 26, 1928.

Linn R. Blanchard, Chief, Division of Accessions, Library of Congress, Washington, D. C., to Laura Gilpin. May 7, 1930.

Brenda Putnam, New York, New York, to Laura Gilpin. November 9, 1930.

Beth Huning, Director, National Audubon Society, Tiburon, California, to Eliot Porter. November 15, 1985.

George Williams Eggers, Director, Denver Art Museum, New York, New York, to Laura Gilpin. April 23, 1926.

Ralph B. Bonwit, Director of Exhibits, Photographic Club of Baltimore City, Baltimore, Maryland, to Laura Gilpin. April 21, 1924.

Ralph B. Bonwit, Director of Exhibits, Photographic Club of Baltimore City, Baltimore, Maryland, to Laura Gilpin. May 20, 1924.

M. A. Wilson, T. B. Hagstoz & Son, Refiners and Assayers, Philadelphia, Pennsylvania, to Laura Gilpin. September 30, 1924.

William Clift, Project Coordinator, New Mexico Council on Photography, Santa Fe, New Mexico, to Mr. & Mrs. Porter. October 28, 1988.

John May, Editorial Director, Greenpeace Books, Sussex, England, to Eliot Porter. June 16, 1987.

Thomas Peter Bennett, President, The Academy of Natural Sciences, Philadelphia, Pennsylvania, to Eliot Porter. June 13, 1983.

Maurice Wohlgelernter, Baruch College, New York, New York, to Eliot Porter. December 12, 1979.