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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