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WorldCat is an online catalog stystem which lists the combined collections of 70,000+ libraries in 170 countries.[1]

WorldCat was built by the Online Computer Library Center (OCLC), which is a global cooperative of libraries. WorldCat is maintained by the group of libraries.[2]


In the 1970s, OCLC grew from a regional computer system for 54 Ohio colleges into an international network.[3]

In 1979, the first Canadian and the first international library joined OCLC.[3]


On August 26, 1971, the OCLC Online Union Catalog, now called WorldCat, went online.[4]

  • 2006 -- Deutsche Nationalbibliothek adds 4 million new records


  1. Online computer Library Center (OCLC), "WorldCat facts and statistics"; retrieved 2012-10-19.
  2. OCLC, "Vision, the world's libraries connected"; retrieved 2012-10-19.
  3. 3.0 3.1 OCLC, "History of OCLC; retrieved 2012-10-19.
  4. OCLC, "Brief history of OCLC activities with national libraries outside the U.S."; retrieved 2012-10-19.

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