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About Searching WorldCat Indexes

This guide provides comprehensive information about indexes used to retrieve records from WorldCat. OCLC services, including cataloging and discovery/reference, use the same search indexes. Interfaces for searching WorldCat include:

  • OCLC Connexion® client and browser (cataloging)
  • OCLC CatExpress® in Connexion browser (copy cataloging)
  • OCLC  FirstSearch® (reference)
  • OCLC WorldCat Discovery
  • OCLC WorldShare™ (Acquisitions, Circulation, Interlibrary Loan, Metadata)

This guide shows MARC fields and subfields indexed for each WorldCat index, gives examples, and provides information about how each index works to help construct searches that retrieve the records you need.

Who should use this guide?

This guide is meant for library staff who use the OCLC interfaces listed to search WorldCat.

It is not meant for:

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