Follow these principles for new headings and as closely as possible in evaluating references on existing authority records and in creating automated authority records for headings found in the machine files (or in the manual catalog, if consulted). When the particular reference structure has already been evaluated, it is not necessary to delete references not provided for by these instructions but provided for by earlier editions of these instructions.

Generally, trace a reference from variant forms of entry that apply to the name chosen for the heading. However, do not trace a reference that would normalize to the same form as the heading on the same record or to the same form as a heading on another record. For variant forms of a name, generally, trace only one reference from each variant, normally, constructing it in the form in which it would be constructed if chosen as the heading. If, however, the name chosen for the heading is not in English and the name occurs in an English form, also trace references from the variant forms of entry that apply to the English form. (If, in such a case, there are multiple English forms, choose only one of the English forms to use in tracing references from the different forms of entry.)

Example A

Earlier Names of Corporate Bodies Now Subsumed Under the Heading for a Later Name Through a "See" Reference:

Under earlier cataloging policies, when a corporate body changed it names, the heading was changed and all records revised to use the newer name. The earlier name or names was traced as a see reference to the later form used as the heading. In retrospectively converted records, these situations were identified by a note in the 667 field, e.g., "The following earlier name is a valid AACR2 heading: [earlier name or names in AACR2 form]."

When evaluating references, allow these see references to stand (correcting the form to AACR2 style, if necessary) until an item is received that requires the use of one of these earlier names as an access point. At that time, establish the heading, convert the see reference to a see also reference, and delete the 667 field note. Also, make any other necessary references (cf. LCRI 26.3B-C). Do not change any existing MARC or non-MARC bibliographic records

Example B

Retain the reference and note until publications are received that would require the use of the heading "National Civilian Rehabilitation Conference (U.S.)."

Example C

Correct the reference to the AACR2 form (Granville Brothers Aircraft, Inc.) and retain it and the note until publications are received that require the use of the heading "Granville Brothers Aircraft, Inc."

Unused Subdivisions:

Under earlier cataloging policies , certain corporate subdivisions were not established. Instead, the heading for the parent body was used whenever the subheading would have been used. Usually, an internal LC reference was made from the unused subdivision to the heading for the parent body. In earlier periods of this practice, the unused subdivisions were only listed on the manual authority records for the parent body or were given in a form explanatory reference.

Example D

Whenever one of these unused subdivisions is to be used in current cataloging, establish the subdivision and use it henceforth in all cataloging for which it is appropriate, leaving the existing bibliographic records as they are. Do not make any references between the two headings for the parent and the subdivision, and cancel any references that may already exist in the automated name authority file. Delete the name of the subdivision from the 667 field of the authority record for the parent body.

Information/Publication Agencies:

Under AACR1, rule 18A1, references were made to a parent body from subordinate units that functioned as information or publication agencies. Whenever one of these agencies is encountered in current cataloging, use it henceforth in all cataloging for which it is appropriate, leaving the existing bibliographic records unchanged. Do not make any reference between the two headings for the parent body and the information/publication agency, and cancel any references that may already exist in the automated name authority file.

If the information/publication agency has been established separately, apply these instructions only when the information/publication agency is needed for immediate use as a heading and when it is not (e.g., it is encountered in handling the authority record for the parent body). If, however, the information/publication agency has only been traced as an unused subdivision reference on the manual authority record for the parent body, handle it according to the instructions above for unused subdivisions.

26.3A. See references

26.3B.-C. See also references and Explanatory references

See also:

26. References