Dewey Decimal Classification

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The Dewey Decimal Classification (DDC) is a numerical classification system used in many library catalogs (see article in Wikipedia). The classification is not a free resource, but copyrighted by the Online Computer Library Center (OCLC) since 1988.

Update by Robert: provides linked DDC, under CC license.--Ulla 19:54, 24 August 2009 (UTC)