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Dewey Decimal Classification (DDC), colloquially known as the Dewey Decimal System, is a proprietary library classification system which allows new books to be added to a library in their appropriate location based on subject. It was first published in the United States by Melvil Dewey in 1876. Originally described in a 44-page pamphlet, it has been expanded to multiple volumes and revised through 23 major editions, the latest printed in 2011. It is also available in an abridged version suitable for smaller libraries. OCLC, a non-profit cooperative that serves libraries, currently maintains the system and licenses online access to WebDewey, a continuously updated version for catalogers. — Wikipedia

Dewey Decimal Classification (Encyclopædia Britannica)

Dewey Services (OCLC)
Dewey Resources (OCLC)
Dewey Summaries (OCLC)

The Dewey Program (Library of Congress)

Browse Books by DDC Call Numbers
Melvil Decimal System (Library Thing)


Dewey Decimal Classification (JSTOR)




Here are links to pages about closely related subjects.

Knowledge Form

Preservation Stewardship
History Collection (Classification)
Museum Objects (CCO)
Archive Records (EAD)
Library Resources (DDC, LCC)



1.   The resources on this page are are organized by a classification scheme developed exclusively for Cosma.