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- PAIS
- ProQuest
- Parliament Rolls of Medieval England
- Scholarly Digital Editions
- Parliamentary Papers
- See:
Public Information Online
or House of Commons Parliamentary Papers
- Passport Industrial
- See: Global Market Information Database
- Patrologia Latina Database
- ProQuest Chadwyck-Healey
- Peirce: Collected Papers
- IntLex Past Masters
- Periodicals Archive Online
- ProQuest Chadwyck-Healey
- Perry's Chemical Engineers' Handbook
- See: Knovel Library
- Perseus Digital Library
- Perseus
- Pevsner's Buildings of England, A Compendium
- Oxford University Press
- Pharmaceutical Excipients
- MedicinesComplete
- Philosopher's Index
- Ovid Online
- Physical Education Index
- ProQuest
- PI Navigator
- Perfect Information
- PILOTS
- ProQuest
- POLIS
- Parliamentary Online Indexing Service
- Political Science: A Sage Full-Text Collection
- See: Sage Full-Text Collections
- Project MUSE
- Project MUSE
- ProQuest
- ProQuest
- ProQuest Dissertations & Theses A&I
- ProQuest
- Proteome BioKnowledge Library
- Biobase
- PsycBOOKS
- Ovid Online
- Psychology: A Sage Full-Text Collection
- See: Sage Full-Text Collections
- PsycINFO
- Ovid Online
- Public Information Online
- Dandy Booksellers
- PubMed
- NLM