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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.
lobid-Bibliographic Resources

lobid-resources is a service which offers access to metadata in RDF about bibliographic resources (books, articles, pdfs etc.) with more than 19 million frbr:manifestations with...

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