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310  Current Publication Frequency (NR)

Input Standards

Required if applicable/Optional
1st Indicator  Undefined
blank character Undefined
2nd Indicator  Undefined
blank character Undefined
Subfields (R=Repeatable  NR=Nonrepeatable) Input Standards
ǂa Current publication frequency (NR) Mandatory/Mandatory
ǂb Date of current publication frequency (NR) Required if applicable/Required if applicable


The current publication frequency of a continuing resource (i.e., issues of a serial or updates to an integrating resource). The frequency is given in a coded form Freq, and Regl. Former publication frequencies are given in field 321.

1st Indicator

Undefined. The 1st indicator position is undefined and contains a blank ( blank character ).

blank character


2nd Indicator

Undefined. The 2nd indicator position is undefined and contains a blank ( blank character ).

blank character



ǂa Current publication frequency

Complete statement, exclusive of dates, of the current publication frequency. Use the following guidelines to enter information in subfield ǂa.

  • Spell out an initial number in subfield ǂa.
  • Capitalize the first letter of the first word in subfield ǂa.
  • Enter a comma between subfields ǂa and ǂb.
  • Omit final punctuation unless the field ends with an abbreviation.
310     Annual
310     Continually updated
[Frequency of updates to an online database]
310     Daily (except 12 legal holidays)
310     Irregular
310     Monthly
310     Monthly (except May and July)
310     Nine times a year
310     Quarterly, including annual cumulation
310     Seven times a year
310     Three times a year
310     Updated three times a year
[Frequency of updates to a loose-leaf publication]
ǂb Date of current publication frequency

Date of current publication frequency. Dates are included when the beginning date of the current frequency is not the same as the beginning date of publication, i.e., a former frequency is given in field 321. If issues of a serial only carry numerical rather than chronological designations, the numerical designation is given in subfield ǂb. Uncertain dates that may not be the earliest or latest dates applicable to a recorded frequency are enclosed in angle brackets. When an item has ceased publication, the current frequency date is closed but remains in field 310.

310     Semiannual, ǂb 1990-
321     Annual, ǂb 1984-1989
[Began in 1984; published annually, 1984-1989; and published semiannually, 1990- ]
310     Irregular, ǂb 2006-2008
321     Quarterly, ǂb 1987-2005
[Began in 1987; published quarterly, 1987-2005; published irregularly, 2006-2008; and ceased in 2008]
310     Daily, ǂb no. 24-no. 241
321     Three times a week, ǂb no. 1-no. 23
[Began in 1791; issues numbered 1 through 23 published three times a week; issues numbered 24 through 241 published daily; ceased in 1791]
310     Three times a year, ǂb <2009->
321     Annual, ǂb 1986-2001
321     Irregular, ǂb 2003-
[Began in 1986; published annually, 1986-2001; published irregularly beginning 2003 through an unknown date; and published three times a year by 2009 on]
310     Quarterly, ǂb <1967>-1970
321     Six times a year, ǂb -1924
321     Three times a year, ǂb 1925-<1954>
[Began at an unknown date; published six times a year through 1924; published three times a year beginning 1925 through at least 1954; and published quarterly by 1967 through 1970; ceased in 1970]

This page last revised: August 22, 2016