First Indicator | Second Indicator |
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Undefined # - Undefined |
Undefined # - Undefined |
Subfield Codes | |
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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).
$a - Former publication frequency
The complete statement, exclusive of dates, of the former publication frequency.
310 | ##$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 |
$0 - Authority record control number or standard number
See description of this subfield in Appendix A: Control Subfields.
321 | ##$aannual$b1993-2005$0http://id.loc.gov/vocabulary/frequencies/ann |
$1 - Real World Object URI
See description of this subfield in Appendix A: Control Subfields.
$2 - Source
MARC code that identifies the source of the term or code used to record former publication frequency information.
$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.
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 may be 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>- |