665  History Reference (NR)  (Variable Data Field)

Field definition and scope:

Field 665 contains text for reference notes with historical information for names.  It is provided when more information is needed about the relationships that exist than can be adequately conveyed by using simple cross references generated from 5XX See Also From Tracing fields.  The 665 field may also contain text describing the subject entry treatment for works about the various related headings.

Field 665 is appropriate only in an established heading record.

The 1XX field in the record contains an established heading referred from.

Field 665 contains the history of the name changes and the other established headings referred to.

The established heading in field 1XX is also traced in a 5XX field in the established heading records for the headings referred to in field 665.

Subfield $w/3 (Reference display) in each of the tracing fields contains code d (Reference not displayed, field 665 used).  Code d indicates that the generation of a simple cross reference from the 5XX field should be suppressed.

See example under the description of subfield $a (History reference).

A cross reference may be generated from the 1XX and 665 fields.  A reference instruction phrase is incorporated into the text of subfield $a.  Examples of complex cross reference displays are provided in Reference Note Fields:  Complex Cross References.

The National level record requirement for this field is Optional.

Field 665 is NOT repeatable.

Guidelines for applying content designators:

For indicator and subfield code definitions and examples, National level (NLR) record requirements, and designator repeatability, see table below:

See:  Example for this field.

LC Guidelines:

 665  History Reference

Related MARC fields or documents:

880  Alternate Graphic Representation

Tracings and References - General Information

See also:

663-666  Complex Name References

Variable Data Fields