website Library of Congress says MARC records http://www.loc.gov/marc/umb/um01to06.html Library of Congress says Library of Congress says Understanding MARC Bibliographic Parts: 1-6 collaborative network Library of Congress says MARC record Library of Congress says MARC records Understanding MARC Bibliographic: Parts 1 to 6 Library of Congress says MARC records Library of Congress says Understanding MARC MARC records Library of Congress says MARC records MARC records MARC record machine-readable cataloguing Understanding MARC Bibliographic Parts: 1-6