Guidelines for Usage: 646 Series Classification Practice

NACO LSP Usage:

In a single 646 field, a subfield $5 containing the NUC symbol for the Library of Congress (DLC) precedes a subfield $5 containing the NUC symbol for an LSP participant. Only the NACO LSP participant creating a Series Authority Record may record its series classification practice in field 646, or add its NUC symbol to the field 646 containing the series classification practice for the Library of Congress.

When a pair of 646 fields are appropriate because an LSP participant's classification practice differs from that of the Library of Congress, the 646 field representing the Library of Congress practice precedes that of the LSP participant.

Inclusion of the field 646 relating to the NACO LSP participant is optional unless the participant is also contributing a bibliographic record related to the series. When field 646 is used, it must contain a subfield $5 to identify the user of the classification practice.

LC Usage:

LC practice is to carry over any pre-AACR 2 classification practice to its AACR 2 cataloging.

For more information on LC Guidelines, select:

Guidelines for Usage: NACO/LSP and LC