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Reference Sources - P
- Paleontology Portal
- The Parallel history project on NATO and the Warsaw Pact
- PE Central
- Periodic Table (WebElements)
- Perry-Castenada Map Collection, UT-Austin
- Pew Global Attitudes Project
- Pew Internet & American Life Project
- Physical Education Lesson Plans
- Physical Reference Data (NIST)
- Physics Formulary
- Physical Reference Data (NIST)
- Plants Database (USDA)
- Poets.Org
- Poisonous Plants Database
- Policy Library
- Polling the Nations (1986-)
- Poly-cy: Internet Resources for Political Science
- Population Reference Bureau
- Portal Wisconsin
- Prints and Photographs Online Catalog (PPOC)
- Project planning, a tutorial - Institute of Museum and Library Services
- Property Assessment Information – City of Racine
- Proposal writing short course - Foundation center
- Psybox: Psychology Dictionary
- Psychology Glossary
- Psych Web
- Public Agenda Online
- Public and Private Laws
- Public Radio Podcast Directory
- Public Relations Firms
- Pulitzer Prizes