Need help understanding MARC tags? Turn to Tag of the Month. This helpful resource features a new topic every month, including a description of the tag's uses and working examples.
The Tag of the Month page also features links to other helpful cataloging resources, including the online version of Understanding MARC Bibliographic: Machine-Readable Cataloging, the definitive book on MARC, co-authored by the Library of Congress and Follett Software.
Part of Follett Software's website, along with "Ms. MARC."