21.2A. Definition
Title Changes of Serials (Including Numbered Monographic Series), Unnumbered Monographic Series, and Unnumbered Multipart Items
In applying category a. of 21.2A1, consider that at least the following are covered in addition to those explicitly mentioned in the "e.g.," statement:
Arabic numeral(s) vs. roman numeral(s)
Hyphenated words vs. unhyphenated words
Initialisms and letters with separating punctuation vs. those without separating punctuation
Numbers or dates vs. spelled-out forms
One spelling vs. another spelling: apply this criterion both in the case of ordinary orthographic variations and in the case of official orthographic changes
One-word compounds vs. two-word compounds, whether hyphenated or not
Signs and symbols (e.g., "&") vs. spelled-out forms
In applying category b., do not consider the title proper to have changed if words that link the title to the chronologic or numeric designation (e.g., "for the year ending June 30" or "for the fiscal year") are added, changed, or dropped. Such words may be ignored even when they come within the first five words of the title; however, when this is the case, consider making an added entry for the variant form.
In applying category c., also, do not consider the title proper to have changed if the name of the issuing body or an element of its hierarchy at the end of the title changes from one form to another (e.g., from an initialism to the spelled-out form, from a longer form to a shorter form).
However, if the body's name is deleted at the end of the title because that body has changed its name (cf. 24.1C) or that body is no longer associated with the item, consider that the title proper has changed.
Note that if the change is in the name of a body that is part of the title proper and the change requires the creation of a new heading for the body (cf. 24.1C), it is necessary to consider that the title proper has changed. This statement takes precedence over all the preceding statements.
See also:
