http://worldcatlibraries.org/ - "World Cat" - Bestandsanzeigen aus ca. 10.000 Bibliotheken frei durchsuchbar... - via i.
...auch via GoogleBooks - http://books.google.de - seit Herbst 2006
OCLC Online Computer Library Center, Inc. http://www.oclc.org. Founded in 1967, OCLC Online Computer Library Center is a nonprofit, membership, computer library service and research organization dedicated to the public purposes of furthering access to the world's information and reducing information costs. More than 53,548 libraries in 96 countries and territories around the world use OCLC services to locate, acquire, catalog, lend and preserve library materials.