Book excerpt: If you have an automated cataloging system and do any cataloging using the MARC records, this is the users bible. Arranged like a dictionary, tag by tag, the user can look up any tag and find easy-to-understand explanations of what information to put in the tag and in what form. Piepenburg not only explains the tag, but gives numerous examples that cover 90% of the cases one would face. In addition, references to AACR2 and USMARC Bibliographic rules and rule numbers help the cataloger refer to the authoritative sources quickly to make correct judgements.