Encyclopedias, Almanacs, Transcripts, and Maps
- Politics and Religion: Politics and Judaism
- Politics and Religion: Politics and Native American Religious Traditions
- Politics and Religion: Politics and Oceanic Religions
- Pollution Control
- Pollution Credits
- Pollution Prevention Act (1990)
- Polunin, Nicholas (1909 – 1997) English Environmentalist
- Polychaeta (Clam, Sand, and Tubeworms)
- Polychlorinated Biphenyls
- Polycyclic Aromatic Hydrocarbons
- Polycyclic Organic Compounds
- polyethene
- Polymixiiformes (Beardfishes)
- Polynesian Religions
- Polynesian Religions: An Overview
- Polynesian Religions: Mythic Themes
- Polyplacophora (Chitons)
- Polypteriformes (Bichirs)
- polytetrafluoroethene
- Pompadour, Jeanne-Antoinette Poisson, Marquise de