Betsy [Elizabeth Forster], Colorado Springs, Colorado, to Laura Gilpin. October 24, 1925.

Laura Gilpin, Colorado Springs, Colorado, to Register of Copyrights. August 15, 1925.

Laura Gilpin to Mrs. White. January 27, 1926.

Brochure for Century Universal Camera, Folmer Graflex Corporation. n.d.

Mrs. Winston, Colorado Springs, Colorado, to Laura Gilpin. n.d.

Quote from "The Firmament of Time" by Loren Eiseley. n.d.

Quote from "The Year of Decision: 1846" by Bernard DeVoto. n.d.

Quote from "Traveler in the Wilderness" by Cid Ricketts Sumner. n.d.

Statement by Eliot Porter. n.d.

Draft of "For A More Livable Planet" by Eliot Porter. n.d.

Draft manuscript of "The Adirondacks." n.d.

Draft of Bird Photography with some observations on Bird Behavior and a few comments on Conservation. n.d.

Draft of Bird Photography with some observations on Bird Behavior and a few comments on Conservation. n.d.

Information and Membership Form for Friends of the Earth. n.d.

Biography of David R. Brower, Friends of the Earth. n.d.

Information and services by Ken Lieberman Laboraties, Inc. n.d.

"The Geology of Glen Canyon." n.d.

"The Way Birds Fly." n.d.

By-Laws of New Mexico Council on Photography. n.d.

John Wawrzonek to Eliot Porter. November 15, 1987.