Authors: P
- Tyssot de Patot, Simon 1655-1738
- Tytler, Patrick Fraser 1791-1849
- Ubaldini, Petruccio -
- Uccellini, Primo 1804-1882
- Ungern-Sternberg, Maria Stella Petronilla, Baroness 1773-1843
- Union Pacific Railroad Company -
- Union Pacific Railroad Company. Passenger Department -
- United States. Bureau of Naval Personnel -
- United States. Congress. House. Committee on Patents -
- United States. Congress. Senate. Committee on Patents -
- United States. Constitutional Convention (1787) -
- United States District Court for the Eastern District of Pennsylvania -
- United States. Executive Office of the President -
- United States. Federal Interdepartmental Task Force on the Potomac -
- United States. Government Printing Office -
- United States Marine Band -
- United States. National Park Service -
- United States. National Park Service. Division of Publications -
- United States. Office of Chief of Counsel for the Prosecution of Axis Criminality -
- United States. Patent Office -
- United States. Presidents -
- United States. Public Health and Marine Hospital Service -
- United States. Public Health Service -
- United States. Warren Commission -
- United States. Work Projects Administration -
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