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