Barbara B. Riley, Sierra Club, New York, New York, to Eliot Porter. November 6, 1968.

Nell Dorr, West Branch, Westport, Connecticut, to John Van Nostrand Dorr. n.d.

Nell Dorr, West Branch, Westport, Connecticut, to John Van Nostrand Dorr. n.d.

Joseph R. Taylor and Frederick F. Lovejoy Jr., Taylor and Lovejoy, South Norwalk, Connecticut, to Robert Mayo Tenery. May 12, 1948.

Walter Rumsey Marvin, Executive Director, Martha Kinney Cooper Ohioana Library Association, Columbus, Ohio, to Nell Dorr. March 7, 1955.

Clarence John Laughlin, New Orleans, Louisiana, to "My Friends." December 28, 1982.

Frank Piskor, Vice President for Academic Affairs, Syracuse University, Syracuse, University, to Clara E. Sipprell. June 13, 1960.

Cusie Pfeifer, Marcuse Pfeifer Gallery Photography, New York City, New York, to Carlotta Corpron. May 9, 1978.

Sally Forbes, Picture researcher, McGraw-Hill Book Company, New York, New York, to Eliot Porter. August 1, 1969.

Scott Bartlett, Editor, McGraw-Hill Book Company, Inc., New York, New York, to Eliot Porter. October 12, 1953.

William Bridges, Curator of Publications, New York Zoological Society, New York, New York, to Eliot Porter. April 11, 1942.

Eliot Porter, Santa Fe, New Mexico, to Tom O. Meeks, Chief Watershed Party, New Mexico State Office. September 8, 1959.

William Bridges, Curator of Publications, New York Zoological Society, New York, New York, to Eliot Porter. May 18, 1942.

Keith Henney, Editor, Photo Technique The Magazine of Practical Photography, New York, New York, to Eliot Porter. December 29, 1939.

Harold M. Case, Henry Field Seed Company, Shenandoah, Iowa, to Erwin E. Smith, November 3, 1921.

Erwin E. Smith, School of the Museum of Fine Arts, Boston, Massachusetts, to L. B. Thomas. January 30, 1909.

Erwin E. Smith, School of the Museum of Fine Arts, Boston, Massachusetts, to L. B. Thomas. March 14, 1909.

Jack Bowling, United States Ship California, San Pedro, Colorado, to Erwin E. Smith. November 10, 1927.

William S. Hart, The William S. Hart Company, Hollywood, California, to Erwin E. Smith. July 20, 1926.

Harry Peyton Steger, Doubleday Page & Co., New York, New York, to Erwin E. Smith. March 20, 1909.