Where can I find instructions on creating an undifferentiated personal name authority record?
An undifferentiated personal name is called for by AACR 22.20 and by LCRI 22.17-22.20 as a last resort after all the possible additions to a new personal or to an existing personal name to break a conflict have been exhausted. NACO procedures for creating an undifferentiated personal name NAR are discussed during NACO training and follow the guidelines in: 1) The MARC 21 Authority Format. The 670 pages of the basic text state: “When a 100 heading is used for more than one person … subfield $a may contain a descriptive term for an author enclosed within brackets…” and shows examples of the repeated 670 (1 with the bracketed information and 1 with the usual source citation). 2) Descriptive Cataloging Manual Z1. There are several places in the DCM Z1 where information on undifferentiated NARs is contained. a) The Z1 Introduction, NACO normalization section states: “If personal names cannot be distinguished, create an undifferentiated personal name authority record. The heading can rep
