Author/Creator
- United States354
- United States. Congress. House200
- ebrary, Inc178
- Library of Congress. Congressional Research Service128
- Electronic Enlightenment Project, issuing body126
- SpringerLink (Online service)118
- ProQuest (Firm)105
- Project Muse96
- United States. Department of the Interior96
- United States. Congress. Senate. Committee on the District of Columbia. (1816-1977)83
- United States. Congress. House. Committee on the District of Columbia. (1808- )76
- United States. Congress. Senate70
- Brook Lapping Productions64
- United States. Department of the Interior. Bureau of Education. Commissioner of Education49
- United States. Department of the Interior. Bureau of Education (1869-1939)42
- Evans Woolfe (Firm)41
- Big Heart Media39
- Libra Television37
- United States. Commissioners of the District of Columbia (1874-1967)34
- Adam Matthew Digital (Firm), digitiser31