More than 70 motion picture films, photographic and written materials regarding ornithological trips taken by Lawrence Grinnell from 1938 to 1971; correspondence and a pamphlet, "The 1957-1958 New Zealand-Australia Expedition of the Laboratory of Ornithology"; materials pertaining to his dissertation A Study of the Common Redpoll, a notebook of Cornell ornithology seminars and Canoeable Waterways of New York State and Vicinity written by Grinnell.

Photographs, negatives, and letters received by Gray concerning the Gray Africa Expedition to Kenya, and to Eastern and Western Africa, under the sponsorship of the Academy of Natural Sciences.