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LinkedLCCN
A wrapper for the Library of Congress' LCCN Permalink service which models the MARCXML output as linked data in RDF. -
GovTrack.us U.S Congress Legislative Data
U.S. Congress data including all Members of Congress since the beginning of the United States, legislative data including bills, sponsorship, roll call votes since around 1990. -
MARC Codes List
Currently provides the MARC codes (http://www.loc.gov/standards/valuelist/) for languages, geographic areas, countries and forms of musical composition.