Encyclopedias, Almanacs, Transcripts, and Maps
- Periodic Table of the Elements: Ununoctium
- Periodic Table of the Elements: Ununpentium
- Periodic Table of the Elements: Ununseptium
- Periodic Table of the Elements: Ununtrium
- Periodic Table of the Elements: Uranium
- Periodic Table of the Elements: Vanadium
- Periodic Table of the Elements: Xenon
- Periodic Table of the Elements: Ytterbium
- Periodic Table of the Elements: Zinc
- Periodic Table of the Elements: Zirconium
- Perkins School for the Blind
- Perl, Martin Lewis
- Perley, Sir George Halsey
- Perlis
- Perlmutter, Saul
- permeability, magnetic
- Pernambuco
- Pernau
- Pernik
- Perón, Isabel María Martínez de