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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.
MARC Codes List

Currently provides the MARC codes (http://www.loc.gov/standards/valuelist/) for languages, geographic areas, countries and forms of musical composition.
Bio2RDF::GenBank

GenBank is the NIH genetic sequence database, an annotated collection of all publicly available DNA sequences.

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