Library of Congress >> MARC >> Bibliographic >> 3XX >> 321

321 - Former Publication Frequency (R)


MARC 21 Bibliographic - Full
October 2001

First Indicator
Undefined
# - Undefined

Second Indicator
Undefined
# - Undefined


Subfield Codes
$a - Former publication frequency (NR)
$b - Dates of former publication frequency (NR)
$6 - Linkage (NR)
$8 - Field link and sequence number (R)

FIELD DEFINITION AND SCOPE

Former publication frequency of either an item or an update to an item when a current publication frequency is given in field 310 (Current Publication Frequency).


GUIDELINES FOR APPLYING CONTENT DESIGNATORS

INDICATORS

SUBFIELD CODES

$a - Former publication frequency
The complete statement, exclusive of dates, of the former publication frequency.
310 ##$aMonthly,$b1985-
321 ##$aTen no. a year,$b1982-1984
310 ##$aAnnual,$b1983-
321 ##$aMonthly,$bMar. 1972-Dec. 1980
321 ##$aSemiannual,$b1981-1982
A phrase such as frequency varies may be used in field 321 when more than three past frequencies are known.
310 ##$aMonthly,$bJan. 1984-
321 ##$aFrequency varies,$b1966-1983
310 ##$aUpdated quarterly,$bJan.-Mar. 2001-
321 ##$aFrequency of update varies
$b - Dates of former publication frequency
310 ##$aAnnual,$b1983-
321 ##$aBiennial,$b1981/1982
310 ##$aUpdated irregularly,$b2001-
321 ##$aUpdated monthly,$b1998-2000

If subfield $a contains a phrase such as frequency varies, subfield $b contains the inclusive date for the frequencies.

310 ##$aBimonthly,$b1970-
321 ##$aFrequency varies,$b1920-1969
$6 - Linkage
See description of this subfield in Appendix A: Control Subfields.
$8 - Field link and sequence number
See description of this subfield in Appendix A: Control Subfields.

INPUT CONVENTIONS

Punctuation - Field 321 does not end with a mark of punctuation unless the last word in the field is an abbreviation, initial/letter, or other data that ends with a mark of punctuation. A comma is recorded at the end of subfield $a when subfield $b is present.
Order of fields - When more than one 321 field is given, their directory entries are usually arranged in chronological order (earliest to latest).
Temporary Data - Known date(s) that may not be the earliest or latest date associated with the former frequency is customarily enclosed within angle brackets (<...>) or omitted.
321 ##$aQuarterly,$b19<85>-

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