Encyclopedias, Almanacs, Transcripts, and Maps
- periastron
- Peribonca
- Périer, Casimir Pierre
- Periodic Table of the Elements ( (table))
- Periodic Table of the Elements: Actinium
- Periodic Table of the Elements: Aluminum
- Periodic Table of the Elements: Americium
- Periodic Table of the Elements: Argon
- Periodic Table of the Elements: Arsenic
- Periodic Table of the Elements: Barium
- Periodic Table of the Elements: Beryllium
- Periodic Table of the Elements: Bismuth
- Periodic Table of the Elements: Bohrium
- Periodic Table of the Elements: Calcium
- Periodic Table of the Elements: Californium
- Periodic Table of the Elements: Cerium
- Periodic Table of the Elements: Cesium
- Periodic Table of the Elements: Chlorine
- Periodic Table of the Elements: Cobalt
- Periodic Table of the Elements: Copernicium