Encyclopedias, Almanacs, Transcripts, and Maps
- phonon
- Phorcus
- phosphatidic acid
- photocell
- photocomposition machines
- photoengraving
- photographic processing
- photography, still
- photogravure
- photosynthetic phosphorylation
- Phou Bia
- Phraates
- Phrixus
- phthalates
- Phumiphon
- Phygellus
- physician's assistant
- Physicians, Nurses, Dentists, and Other Health Care Practitioners
- Pi y Margall, Francisco
- Pi-beseth