A. F. Betzel, Office of Polar Programs, Washington, D.C., to Mrs. Porter. January 22, 1975.

Linda Rinkinen, Project Coordinator, National Geographic Society, Washington, D.C., to Eliot Porter. September 7, 1979.

Marion Edey, Chairman, League of Conservation Voters, Washington, D.C., to Supporter. November 17, 1972.

Wade Van Dore, Clearwater Beach, Florida, to Eliot Porter. June 7, 1978.

Robert L. Nienkamp, Meisel Photochrome Corporation, Dallas, Texas, to Eliot Porter. July 10, 1974.

Robert H. Rutford, Head, Office of Polar Programs, Washington, D.C., to Eliot Porter. n.d.

Price Lewis, Jr., Manager, Polar Operations, Washington, D.C., to Eliot Porter. April 26, 1976.

DeWitt C. Baker, E. P. Dutton, New York, New York, to Eliot Porter. August 7, 1978.

Eliot Porter, to Department of Photography, The Art Institute of Chicago. November 21, 1976.

Loan Agreement/Contract between Eliot Porter and the University of Colorado. November 30, 1976.

"Community Support Bulletin" from the National Air Pollution Control Administration. March 15, 1970.

Ian Ballantine, Ballantine Books, Inc., New York, New York, to David Brower, Sierra Club. September 25, 1967.

Agreement between Eliot Porter and E. P. Dutton & Co., Inc. January 10, 1977.

Marshall Townsend, Director, The University of Arizona Press, Tucson, Arizona, to Eliot Porter. April 14, 1972.

Paul L. Hill, Clinical Psychologist, West Orange, New Jersey, to E. P. Dutton & Co., Inc. October 13, 1972.

Leicester H. Sherrill, The University of Arizona Foundation, Tucson, Arizona, to Mrs. Bartley Cardon. May 7, 1976.

Thomas Peter Bennett, The Academy of Natural Sciences, Philadelphia, Pennsylvania, to Eliot Porter. May 12, 1983.

John May, Editorial Director, Greenpeace Books, Sussex, England, to Eliot Porter. May 7, 1987.

Frank Aoi, Consultant, Corrales, New Mexico, to Eliot Porter. January 25, 1988.

Tim Callahan, Rochester, New York, to Eliot Porter. May 2, 1983.