Guidelines for Usage: 645 Series Tracing Practice

NACO LSP Usage:

In a single 645 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 tracing practice in field 645, or add its NUC symbol to the field 645 containing the series tracing practice for the Library of Congress.

When a pair of 645 fields are appropriate because an LSP participant's tracing practice differs from that of the Library of Congress, the 645 field representing the Library of Congress practice precedes that of the LSP participant.

Inclusion of the field 645 relating to the NACO LSP participant is optional unless the participant is also contributing a bibliographic record related to the series. When field 645 is used, it must contain a subfield $5 to identify the user of the tracing practice.

LC Usage:

When LC tracing practice has changed due to the adoption of AACR 2 , an additional 645 field is added to a series authority record to represent the earlier practice. The first 645 represents the AACR 2 practice, with the phrase "items cataloged after Dec. 31, 1980" in subfield $d. A second 645 represents the pre-AACR 2 practice, with the phrase "items cataloged before Jan. 1, 1981" in subfield $d.

For more information on LC Guidelines, select:

Guidelines for Usage: NACO/LSP and LC

To return:

Use the key.