Other Library Catalogues: International

• LibDex
  A searchable listing of world libraries, browsable by country or by type of Online Public Access Catalogue (OPAC) software used.
• WorldCat.org
  This site opens the complete WorldCat database to the public, building on the favorable reception of OCLC's Open WorldCat Program which was launched in the summer of 2003.

United States

• LibDex: United States (by state)
  A comprehensive listing of libraries in the U.S., arranged by state.
• Library of Congress (U.S.)
  The catalogue of the U.S. Library of Congress is one of the largest online library catlogues in existence, and supports many different methods of searching.