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310 CURRENT PUBLICATION FREQUENCY
 
 

Field 310 indicates the current frequency of issuance of a periodical series (LDR position 07 = s).

Subfield $a contains the frequency statement without dates. In case the frequency of a periodical series changes, the date of the current frequency is recorded in subfield $b and the earlier frequency is recorded in field 321.

The following frequency statements might be used in subfield $a:

    Annual
    Frequency unknown
    Frequency varies
    Issued every [three] [ weeks, months, years]
    Issued every two years
    Issued twice a week
    Issued twice a month
    Issued twice a year
    Three issues yearly
    Monthly
    Quarterly
    Weekly

Examples:

310 $a Annual
310 $a Bimonthly (monthly June-July)
310 $a Monthly (except July and Aug.)
310 $a Monthly, including annual cumulation

310 $a Monthly, $b 1958-1976
[Serial ceased publication in 1976]
321 $a Bimonthly, $b 1954-1957

310 $a Five issues a year, $b 1990-
321 $a Four issues a year, $b 1970-1989



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Last updated: 16 May 2008