Major Library Catalogs
Bibliotheque Nationale de France
British Library
Center for Research Libraries (CRL)
Columbia University
Cornell University
Harvard University (HOLLIS)
Library of Congress (LOCIS)
New Haven Free Public Library
New York Public Library (CATNYP)
National Library of Medicine (NLM Locator)
Northwestern University (NUCat)
Oxford University (OLIS)
Southern Connecticut State University(CONSULS)
Smithsonian Institution (SIRIS)
University of California (MELVYL)
University of Chicago
University of Michigan (MIRLYN)
University of Pennsylvania (FRANKLIN)
University of Texas

Gateways to other Library Catalogs
Libdex - The Library Index
Libraries On The Web (Libweb)

CCFR/Catalogue Collectif de France
Consortium of University Research Libraries U.K. and Ireland
Eureka
Gabriel GAteway and BRIdge to Europe's National Libraries
Karlsruher Virtueller Katalog
National Library Catalogues Worldwide
reQuest Statewide Library Catalog Connecticut Libraries
WorldCat