Supply 670 citations to an existing authority record in the following two situations:

Additions or changes have been made to the record, and the changes must be justified.

Important new information is found about a heading that warrants inclusion.


1.   Apply the principles in the section New Authority Records -- 670 Field in formulating additional 670 citations.

2.   Generally do not change the order of the existing 670 fields already cited in the record.  New 670 fields will simply be listed after those already given.

3.   Do not routinely delete 670 fields already cited when the addition of new 670 fields makes the earlier ones irrelevant.

4.   For undifferentiated personal name authority records, follow the guidelines in this online help.

See also:

Section II:  Additions and Changes to Authority Records