Patrick F. Noonan, President, The Nature Conservancy, Arlington, Virginia, to Eliot Porter. July 16, 1975.

William George, University of Arizona, Tucson, Arizona, to Eliot Porter. October 31, 1959.

Paul Anbinder, Hudson Hills Press, Inc., New York, New York, to Eliot Porter. August 22, 1979.

Julian H. Fisher, Yale College, New Haven, Connecticut, to Eliot Porter. November 9, 1967.

Loren C. Eiseley, University of Pennsylvania, Philadelphia, Pennsylvania, to Eliot Porter. December 11, 1962.

Paul Brooks, Houghton Mifflin Company, Boston, Massachusetts, to Eliot Porter. October 21, 1966.

Teresa Kilham, New York, New York, to Eliot Porter. December 15, 1963.

John Dressman, Santa Fe, New Mexico, to Eliot Porter. June 7, 1972.

Homer F. Green, Thornwood, New York, to Eliot Porter. May 26, 1972.

J. Lionberger Davis, Princeton, New Jersey, to Eliot Porter. December 17, 1960.

Bill George, University of Arizona, Tucson, Arizona, to Eliot Porter. July 4, 1959.

Bob, Walter Gropius and Marcel Breuer Associated Architects, Cambridge, Massachusetts, to Eliot Porter. n.d.

David W. Gengler, Colorado Springs, Colorado, to Eliot Porter. November 25, 1972.

H. A. Belt, The Fred Harvey Company, Kansas City, Missouri, to Laura Gilpin. March 12, 1928.

Anson Herrick, Director, Pictorial Photographic Society of San Francisco, San Francisco, California, to Laura Gilpin. December 15, 1928.

G. H. S. Harding, Secretary-Treasurer, Pictorial Photographic Society, San Francisco, California, to Laura Gilpin. December 14, 1928.

Laura Gilpin, Colorado Springs, Colorado, to A. J. Connell. December 16, 1929.

D. E. MacKenzie, Manager, Provincial Exhibition, New Westminster, British Columbia, to Laura Gilpin. March 5, 1929.

J. Walter Fewkes, Chief, Bureau of American Ethnology, Smithsonian Institution, Washington D. C., to Laura Gilpin. February 20, 1926.

Laura Gilpin, Colorado Springs, Colorado, to Ralph G. Cahn. January 19, 1926.