Author/Creator
- United States789
- Library of Congress. Congressional Research Service507
- Films for the Humanities & Sciences (Firm)226
- Infobase226
- United States. Congress. House215
- United States. Congress. Senate166
- United States. Department of the Interior128
- Infobase, film distributor121
- United States. Forest Service96
- United States. Congress. Senate. Committee on Interior and Insular Affairs. (1948-1977)94
- ebrary, Inc83
- United States. Congress. House. Committee on Public Lands. (1805-1951)71
- United States. Bureau of Land Management67
- United States. Natural Resources Conservation Service63
- United States. Congress. House. Committee on Agriculture. (1820- )62
- United States. Congress. House. Committee on Interior and Insular Affairs. (1951-1993)60
- United States. Department of Agriculture59
- International Union for Conservation of Nature and Natural Resources56
- United States. Congress. Senate. Committee on Agriculture and Forestry. (1884-1977)55
- United States. National Forest Reservation Commission (1911-1976)53