C. A. Miller, The Stevens-Nelson Paper Company, New York, New York, to Laura Gilpin. December 2, 1940.

Maud E. [Herbert?], Birmingham, Michigan, to Laura Gilpin. October 1, 1940.

George Nelson, President, The Stevens-Nelson Paper Company, New York, New York, to Laura Gilpin. September 10, 1940.

Jean Eschmann, The National Library Bindery of Ohio, East Cleveland, Ohio, to Laura Gilpin. September 18, 1941.

Laura Gilpin, Colorado Springs, Colorado, to William H. Cowles. August 19, 1940.

Laura Gilpin, Colorado Springs, Colorado, to Mr. Walter Frese, Hastings House Publishers. November 6, 1941.

Laura Gilpin, Colorado Springs, Colorado, to Mr. Walter Frese, Hastings House Publishers. September 30, 1941.

J. E. Krantz, The American Platinum Works, Newark, New Jersey, to Laura Gilpin. April 11, 1940.

Anne Dirkes Kobor, National Geographic Society, Washington, D.C., to Eliot Porter. May 15, 1963.

Robert B. Anderson, Roswell, New Mexico, to Eliot Porter. February 26, 1979.

David Hunter McAlpin, Minerva, New York, to Eliot Porter. September 6, 1977.

Nancy and Beaumont Newhall, Rochester, New York, to Eliot Porter. January 4, 1971.

New Mexico Chapter of The Nature Conservancy Board of Trustees Minutes. July 6, 1979.

Dianne Hennes, The Nature Conservancy, Minneapolis, Minnesota, to Spencer Beebe. March 2, 1978.

Joseph Wood Krutch, Tucson, Arizona, to Miss Howe. November 1, 1953.

Dave McAlpin, The University Club, New York, New York, to Aline and Eliot. October 11, 1976.

David Hunter McAlpin, Princeton, New Jersey, to Eliot Porter. June 2, 1977.

David H. McAlpin, Princeton, New Jersey, to Eliot Porter. October 17, 1979.

David Hunter McAlpin, Minerva, New York, to Eliot Porter. August 3, 1981.

Nancy Newhall, Laconia, New Hampshire, to Eliot Porter. February 8, 1947.