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Author/Creator
- United States788
- Library of Congress. Congressional Research Service507
- Films for the Humanities & Sciences (Firm)237
- Infobase237
- United States. Congress. House212
- United States. Congress. Senate163
- United States. Department of the Interior125
- Infobase, film distributor123
- United States. Forest Service95
- United States. Congress. Senate. Committee on Interior and Insular Affairs. (1948-1977)91
- ebrary, Inc85
- United States. Congress. House. Committee on Public Lands. (1805-1951)71
- United States. Natural Resources Conservation Service62
- United States. Congress. House. Committee on Agriculture. (1820- )60
- United States. Congress. House. Committee on Interior and Insular Affairs. (1951-1993)59
- United States. Bureau of Land Management58
- United States. Department of Agriculture58
- International Union for Conservation of Nature and Natural Resources55
- United States. Congress. Senate. Committee on Agriculture and Forestry. (1884-1977)54
- United States. National Forest Reservation Commission (1911-1976)53