Encyclopedias, Almanacs, Transcripts, and Maps
- Photography, Electronic
- Photography, Electronic
- Photosynthetic Microorganisms
- Photovoltaic Cell
- Photovoltaic Cell
- Phouka (or Puca)
- Phreno-Magnet and the Mirror of Nature(Journal)
- Phreno-Mesmerism (or Phreno-Magnetismor Phrenopathy)
- Phrenology in Nineteenth-Century Britain and America
- Phyllorhodomancy
- Physical Evidence
- Physical Science in India
- Physical Sciences
- Physical World
- Physiology, Comparative
- Physiology, Comparative
- Phytonutrients
- Pi Sheng
- Piankhi
- Piccard, Jacques Ernest-Jean (1922- )