Eliot Porter to Allen Schor, Wein Products Inc. December 15, 1969.

Eliot Porter to Allen Schor, Wein Products Inc. November 17, 1969.

Patricia Whipple, Northbrook, Illinois, to Eliot Porter. December 10, 1968.

Patricia Whipple, Northbrook, Illinois, to Eliot Porter. December 5, 1968.

Richard Butler, Hawthorn, Victoria, Australia, to Eliot Porter. July 20, 1988.

[Eliot Porter] to Ken Lieberman, Ken Lieberman Laboratories Inc. September 27, 1985.

Adele Auchincloss, Secretary, Natural Resources Defense Council, New York, New York, to The Chairmain's Council, December 11, 1987.

Jane Felix White, New York, New York, to Laura Gilpin. January 22, 1926.

Dorothy Lee DeWitt, Knoxville, Maryland, to Laura Gilpin. September 3, 1927.

Francis Gilpin, Amarillo, Texas, to Francis Gilpin. August 22, 1927.

Cousin Hattie [Gilpin], Boyce, Virginia, to Francis Gilpin. August 22, 1927.

Anna Ayres Johnson, Brackney, Pennsylvania, to Laura Gilpin. August 30, 1927.

Dorothy Krause, Colorado Springs, Colorado, to Laura Gilpin. August 26, 1927.

J. H. Mackay, Toronto, Canada, to Laura Gilpin. May 27, 1924.

Thorvald Solburg, Register of Copyrights, Library of Congress, Washington, D. C., to Laura Gilpin. October 28, 1925.

Joel Orlen, Executive Office, American Academy of Arts and Sciences, Cambridge, Massachusetts, to Fellows of the Academy. March 23, 1987.

Clark G. Mitchell, Vice-President, The Denver National Bank, Denver, Colorado, to Laura Gilpin. September 25, 1929.

Polly and Carrington Stinson, Denver, Colorado, to Francis Gilpin. August 23, 1927.

F. C. Tilney, Walden Cheam, Surrey, England, to Laura Gilpin. January 2, 1927.

Nora Townsend, Great Falls, Montana, to Frank Gilpin. August 24, 1927.