John Mitchell and David Epp, Editor in Chief and General Manager, Sierra Club Books, New York, New York, to Sierra Club Books Authors, Photographers, Agents, Suppliers, Distributors, and Friends. May 24, 1972.

Ruby Reid Thompson to Nell Dorr. July 3, 1978.

Robert Mayo Tenery to Nell Dorr. August 11, 1945.

Nell Dorr, Centre Harbor, New Hampshire, to John Van Nostrand Dorr. n.d.

Tom Gander, San Francisco, California, to Nell Dorr. February 29, 1982.

Rose Mentzel, Munich, Germany, to Nell Dorr. May 6, 1963.

Margaretta Mitchell to Nell Dorr. November 27, 1962.

Margaretta Mitchell to Nell Dorr. May 14, 1974.

Frederick Mitchell, The Scrimshaw Press, San Francisco, California, to Nell Dorr. September 16, 1975.

Grace M. Mayer, New York, New York, to Nell Dorr. March 17, 1964.

Zona Atherton to Nell Dorr. n.d.

Nell Dorr, Centre Harbor, New Hampshire, to John Van Nostrand Dorr. n.d.

Nell Dorr to John Van Nostrand Dorr. n.d.

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

Goldthwaite H. Dorr III, Curator, to Nell Dorr, n.d.

Nell Dorr, Centre Harbor, New Hampshire, to John Van Nostrand Dorr. n.d.

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

Nell Dorr, Dunedin, Florida, to John Van Nostrand Dorr. n.d.

Nell Dorr to John Van Nostrand Dorr. n.d.

Nell Dorr to John Van Nostrand Dorr. n.d.