Encyclopedias, Almanacs, Transcripts, and Maps
- Petre, Maude Dominica
- petrol engine
- Petroleum Exploration and Recovery
- Petromyzoniformes (Lampreys)
- Pettazzoni, Raffaele
- Pétursson, Hallgrímur
- Pfiesteria
- phaeophyte
- Phallus and Vagina
- Phasmida (Stick and Leaf Insects)
- Phenomenology of Religion
- Philippine Creepers (Rhabdornithidae)
- Philistine Religion
- Philosophy: An Overview
- Philosophy: Philosophy and Religion
- Philosophy: Philosophy of Religion
- Phoenician mythology
- Phoenicopteriformes (Flamingos)
- Pholidota (Pangolins)
- Phoronida (Phoronids)