Author/Creator
- United States268
- United States. Congress. House174
- United States. Interstate Commerce Commission56
- United States. Congress. House. Committee on Claims. (1794-1946)55
- United States. Congress. Senate55
- United States. Congress. House. Committee on Interstate and Foreign Commerce. (1892- 1981)49
- United States. Congress. Senate. Committee on Claims. (1816-1946)46
- United States. Congress. Senate. Committee on Interstate Commerce. (1887-1946)31
- United States. Dept. of the Post Office21
- United States. Congress. House. Committee on the Judiciary. (1813- )20
- Washington Railway and Electric Company17
- Georgetown and Tennallytown Railway Company16
- United States. Department of Justice. Office of the Assistant Attorney General for the Post Office Dept16
- United States. Dept. of the Post Office. Office of the First Assistant Postmaster General16
- United States. Dept. of the Post Office. Office of the Second Assistant Postmaster General16
- United States. Dept. of the Post Office. Office of the Superintendent of Foreign Mails16
- United States. Dept. of the Post Office. Office of the Third Assistant Postmaster General16
- City and Suburban Railway Company (Washington, District of Columbia)15
- United States. Dept. of the Post Office. Office of the Topographer15
- United States. Congress. Senate. Committee on the Judiciary. (1816- )14