While most serials publish their individual issues once, in a regularly numbered and/or dated order, some republish specific issues as revised editions of an earlier number.  Sometimes, also, an issue of a serial might constitute a revised edition of another work.  As with any other serial, the cataloger should describe the serial from the first or earliest issue of the publication that is available.  If the earliest piece in hand is a revised edition of an earlier number, the description, including the numbering, should be based on that revision.

245  00  $a Perspectivas terapéuticas con su fundamento farmacológico.

362  1#   $a Began in 1968?

500  ##   $a Description based on: Vol. 1, 3a ed. (1979).

[Note that "1979" refers to the date of the 3rd edition of vol. 1.]

245  00  $a Kulturelle Arbeitshefte

362  1#  $a Began in 1979.

500  ##  $a Description based on: 2 (4. Neuaufl.), published in 1988.

515  ##  $a Some vols. issued in revised editions.

245  00  $a Review of federal expenditures to Florida in . . . : $b with particular emphasis on federal grant expenditures to Florida's state and local governments.

500  ##  $a Issue for 1999 is a revised edition of: Review of federal expenditures with particular emphasis on federal grant expenditures to Florida's state and local governments, preliminary staff report Feb. 11, 1998.

500  ##  $a Description based on: Fiscal year 1997/98.

730  0#  $a Review of federal expenditures with particular emphasis on federal grant expenditures to Florida's state and local governments.

245  02  $a A registry of women in religious studies.

362  1#  $a Began with 1972 issue.

500  ##  $a Description based on: 1976 rev. ed.

[Note that this is not a revision of a specific earlier issue of the serial (see CCM 9.2.2b.), but simply the publisher's wording describing the update of the Registry.]

See also:

8.5.  Special problems associated with recording the designation