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WorldCat Only
WorldCat is a collaboratively-produced network of library services built upon a database of bibliographic, ownership and other forms of metadata. The core WorldCat database contains the merged catalogs of thousands of OCLC member libraries and is collectively maintained by those members' information professionals.
OCLC Base
Contains Includes WorldCat, OCLC ArticleFirst, FirstSearch Electronic Collections Online (bibliographic index only) and OCLC Union Lists of Periodicals, OCLC PapersFirst, OCLC ProceedingsFirst, ERIC, GPO, MEDLINE and The World Almanac databases
OCLC Collection
Contains WorldCat, OCLC ArticleFirst, FirstSearch Electronic Collections Online database (bibliographic index only) and OCLC Union Lists of Periodicals databases