Encyclopedias, Almanacs, Transcripts, and Maps
- Periodical Literature
- Perissodactyla (Odd-Toed Ungulates)
- Pērkons
- Permaculture
- Permanent Retrievable Storage
- Permeable
- Peroxyacetyl Nitrate (PAN)
- Perry, Fred
- Persecution: Christian Experience
- Persecution: Jewish Experience
- Persian mythology, ancient
- Persistent Compound
- Persistent Organic Pollutants
- Perun
- Pesher
- Pesticide Action Network
- Pesticide Residue
- Pet Trade
- Peter the Apostle
- Petr Moghila