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Thesaurus for Graphic Materials (t4gm.info)

Published in 2009, t4gm.info was a Linked Data rendering in RDFa of the Library of Congress' Thesaurus for Graphic Materials. It is now an early example of a linked data set...
- application/xhtml+xml
- RDF
MARC Codes List

Currently provides the MARC codes (http://www.loc.gov/standards/valuelist/) for languages, geographic areas, countries and forms of musical composition.

You can also access this registry using the API (see API Docs).