Gary A. Randorf, Penn Yan, New York, to Eliot Porter, Photographer, Sierra Club. March 11, 1969.

Jane M. Bagg, Museum Assistant, Massachusetts Institute of Technology, Cambridge, Massachusetts, to Eliot Porter. September 20, 1951.

Joan Waricha, Rights and Permissions, Scholastic Magazines, Inc., New York, New York, to Eliot Porter. January 10, 1974.

Margot Feely, Production Associate, The Metropolitan Museum of Art, New York, New York, to Eliot Porter. January 10, 1974.

R. L. Nienkamp, Plant Manager, Meisel Photochrome Corporation, Dallas, Texas, to Eliot Porter. June 25, 1974.

M. P. Curran, Project Manager, HERO/Palmer Research System, Anaheim, California, to Eliot Porter. August 4, 1976.

Norm Deniston, Assistant Project Manager, HERO/Palmer Research System, Anaheim, California, to Eliot Porter. October 20, 1975.

John Macrae, III, President, E. P. Dutton & Co., Inc., New York, New York, to Timothy Seldes, Russell & Volkening, Inc. December 10, 1976.

Joan Waricha, Rights and Permissions, Scholastic Magazines, Inc., New York, New York, to Eliot Porter. October 12, 1973.

Nancy Newhall, Acting Curator, The Museum of Modern Art, New York, New York, to Eliot Porter. January 5, 1945.

Barbara Ryder Studholme, Reference Librarian, National Geographic Society, Washington, D.C., to Eliot Porter. January 10, 1986.

John Macrae III, Holt, Rinehart and Winston, New York, New York, to Eliot Porter. June 20, 1985.

Frank B. Gill, Chairman, Department of Ornithology, The Academy of Natural Sciences, Philadelphia, Pennsylvania, to Eliot Porter. July 20, 1987.

Robert M. Peck, Fellow of the Academy, The Academy of Natural Sciences, Philadelphia, Pennsylvania, to Eliot Porter. September 13, 1983.

Jay Golan, Administrative Assistant, American Academy of Arts and Sciences, Cambridge, Massachusetts, to Eliot Porter. June 2, 1981.

Gray Williams, Jr., Scholastic Magazines Inc., New York, New York, to Eliot Porter. December 13, 1972.

Kenneth Froehly, Publications Assistant, Sierra Club Books, New York, New York, to Eliot Porter. August 3, 1971.

Ken Lieberman, President, Ken Lieberman Laboraties, Inc., New York, New York, to Eliot Porter. December 4, 1985.

Susan [A.] Smith, Director of Support Services, National Geographic Society, Washington, D.C., to Eliot Porter. August 6, 1990.

Adele Auchincloss, Natural Resources Defense Council, New York, New York, to Eliot Porter. September 25, 1987.