Horticulturalist, conservationist, educator, and clubwoman. Correspondence, printed matter, speeches and writings, clippings, photographs, maps, and other papers relating primarily to Dock's efforts in forestry, conservation, gardening, park development, and nature study in Pennsylvania and elsewhere in the United States as well as in Germany and England.

Botanist, naturalist, and zoologist. Correspondence, letterbooks, diaries, articles and speeches, family papers, field notes and records, memoranda, reports, drawings, bibliographic cards on birds, plants, and animals, maps, scrapbooks, newspaper clippings, printed matter, and photographs relating chiefly to Fisher's activities as an ornithologist and vertebrate zoologist.

Paleontologist, educator, and author. Correspondence, articles, memoranda, notes, reports, speeches, drawings, maps, photographs, memorabilia, printed matter, and other materials mainly concerning Merriam's work as chairman of the National Research Council, president of the Carnegie Institution of Washington, and regent of the Smithsonian Institution.

Zoologist and conservationist. General correspondence, writings, printed matter, and miscellaneous material relating to Osborn's interest in population control, soil conservation, forestry, public health, and natural resources.

Conservationist, chief forester for the United States Department of Agriculture, professor of forestry at Yale University, and governor of Pennsylvania. Primarily correspondence and subject files, together with diaries, memoranda, speeches, articles, reports, financial papers, bulletins, pamphlets, clippings, memorabilia, and other papers relating chiefly to Pinchot's activities in conservation and forestry and to his terms as governor of Pennsylvania.