Robert W. Donovan, Jensen & Baird Attorneys at Law, Portland, Maine, to Eliot Porter. June 8, 1964.

B., Missouri Air Conservation Commission, to Papa [Eliot Porter]. January 31, 1969.

Emma Miller Gilpin, Colorado Springs, Colorado, to Laura Gilpin. December 25, [1918-1923?].

Boxte [Charles Porter], Heidelberg, Germany, to Grandfather [Eliot Porter]. December 7, 1986.

Gladys McConnell Fowler, Colorado Springs, Colorado, to Laura Gilpin. February 17, 1911.

John T. Watson, Watson & Watson Attorneys At Law, Santa Fe, New Mexico, to Eliot Porter. June 24, 1964.

Bebo, St. Louis Post-Dispatch, Saint Louis, Missouri, to Pa [Eliot Porter]. December 19.

Margaret Heydon Folger, Santa Barbara, California, to Laura Gilpin. December 29, 1915.

Anne Simon, Washington, D.C., to Laura Gilpin. January 20, 1916.

Brenda Putnam, Ogunquit, Maine, to Laura Gilpin. July 20, 1917.

Charles I. Berg, New York, New York, to Laura Gilpin. October 8, 1919.

N. V. Moerdyke, Secretary, Camera Pictorialists of Los Angeles, Los Angeles, California, to Laura Gilpin. n.d.

Otto Simon, Washington, D.C., to Laura Gilpin. August 10, 1916.

Ralph B. Bonwit, Director of Exhibits, Photographic Club of Baltimore City, Baltimore, Maryland, to Laura Gilpin. June 4, 1924.

Walter L. Hervey, New York, New York, to Laura Gilpin. December 23, 1921.

Clarence H. White, Clarence H. White School of Photography, New York, New York, to Laura Gilpin. November 1, 1922.

Otto Simon, Washington, D.C., to Laura Gilpin. August 12, 1916.

Eliot Porter, Great Spruce Head Island, Maine, to Meisel Photochrome Corporation. n.d.

Elizabeth Wilson, Sierra Club, San Francisco, California, to Eliot Porter. February 6, 1963.

[Eliot Porter] to C. B. Rogers Morton, Secretary of the Interior. May 2, 1971.