Dewey Decimal Classification

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The Dewey Decimal Classification (DDC) system is the world's most widely used library classification system. It was created by librarian Melville Dewey in the 1872s and has been owned by OCLC since 1988.

It is a system of classifying books and other works which divides human knowledge into ten basic categories, with subdivisions indicated by decimal notation. Dewey Decimal call numbers begin with Arabic numerals.

  • Sample call number: 996.902 H75c

In the United States, most school and public libraries use Dewey Decimal classification, but most research and academic libraries use Library of Congress classification.

As of this writing, the DDC is in its 22nd edition, commonly abbreviated DDC22. The complete DDC schedule is published in hardcopy, normally in four complete volumes, but with DDC22, it is also available online through the web-based utility known as WebDewey, which is also owned and licensed by OCLC.

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