The Dewey Decimal Classification (DDC) system is a general knowledge organization tool conceived by Melvil Dewey in 1873 and published in 1876.
The DDC is published by OCLC Online Computer Library Center, Inc. OCLC owns all copyright rights in the Dewey Decimal Classification, and licenses the system for a variety of uses. The DDC is the most widely used classification system in the world. Libraries in more than 135 countries use the DDC to organize and provide access to their collections, and DDC numbers are featured in the national bibliographies of more than 60 countries.
Click the link on the right-hand side to open the OCLC website to view in your current browser window. From here you can see the various Dewey services available.