Authors: O
- Ulfeldt, Leonora Christina, grevinde 1621-1698
- Underhill, Edward F. (Edward Fitch) 1830-1898
- United States. Army. Signal Corps -
- United States. Department of State -
- United States. Department of the Army. Office of Military History -
- United States. Executive Office of the President -
- United States. Foreign Operations Administration -
- United States. Forest Service. Rocky Mountain Region -
- United States. Government Printing Office -
- United States. National Park Service. Division of Publications -
- United States. Navy Department. Bureau of Ordnance -
- United States. Office of Chief of Counsel for the Prosecution of Axis Criminality -
- United States. Office of Civil Defense -
- United States. Office of Education -
- United States. Office of Strategic Services -
- United States. Patent Office -
- United States. War Department. General Staff -
- University of Oxford. Faculty of Modern History -
- Uotila, Oskar 1853-1903
- Uzanne, Octave 1851-1931
- Van Cleve, Charlotte Ouisconsin Clark 1819-1907
- Vandercook, Margaret 1876-1958
- Van Slyke, D. O. (David Oyer) 1818-1890
- Vaughan, Arthur Owen -
- Veblen, Oswald 1880-1960
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