• Princeton University Catalogs
• Princeton Area Catalogs
• Regional Catalogs
• Global Catalogs (WorldCat, etc.)

Princeton University Catalogs

• Supplementary Catalog
  Includes the Library's holdings cataloged through 1979.
• GPO/Marcive Web Docs
  Provides access to the U.S. documents collection from 1976.
• GEOMAP
  The catalog of Princeton University's map collection.
• Plasma Physics Library Catalog (PPLCAT)
  Bibliographic citations for journal articles, technical reports and conference proceedings in the fields of plasma physics and controlled nuclear fusion, from July 1986 to the present.
• Janet C. Morgan Health and Wellness Library
• Rare Books and Special Collections
  Contains a listing of various Special Collections including manuscripts, university archives, senior theses and more.

Princeton Area Catalogs

• Institute for Advanced Study
• Princeton Public Library
• Princeton Theological Seminary
• Rutgers University Library
• New Jersey Libraries and Catalogs

Regional Catalogs

• Brown University
• Columbia University
• Cornell University
• Dartmouth College
• Harvard University
• Library of Congress
• New York Public Libraries
• New York University
• Temple University
• University of Pennsylvania
• Yale University

Global Catalogs

• WorldCat (OCLC FirstSearch)
  A comprehensive library catalog which lists books, DVDs, videos, music scores, recordings, maps and more.   Includes materials owned by Princeton University Library and other libraries nearby.
• WorldCat.org (OCLC)
  Offers an easy to use interface of WorldCat. Includes materials owned by Princeton University Library and other libraries nearby.  Also includes journal and magazine articles from these databases:  ArticleFirst (general and multidisciplinary), ERIC (education), Medline (medical) and GPO (US government).
• RLIN is now part of WorldCat
• OAIster
  OAIster is a union catalog of digital resources. We provide access to these digital resources by "harvesting" their descriptive metadata
  (records) using OAI-PMH <http://www.openarchives.org/> (the Open Archives Initiative Protocol for Metadata Harvesting)"
• Center for Research Libraries
  Princeton is a member of the Center and may borrow research materials such as foreign and domestic newspapers, foreign dissertations, documents for extended periods.
• LibDex. The Library Index
  Worldwide listing of library homepages, web online catalogs, Friends of the Library pages.
• National and major libraries
  Worldwide listing national and major libraries
• Karlsruhe Virtual Catalog
  Connections to many European library catalogs
• Worldwide library web sites
  Libweb - Library web servers (Worldwide) via WWW