Tag of the Month

Category: Tag of the Month Bibliographic Archives
Title: 321 - Former Publication Frequency (R)

The 321 - Former Publications Frequency tag contains 
the earlier publication frequencies of a serial when 
the frequency has changed. This information is useful 
to the librarian and to the library user. Information 
about past frequencies will help the library user who 
may want to know how often the serial came out during 
a certain period. The information helps the librarian 
in assessing whether the library has received all the 
issues for a particular year. 

The Anglo American Cataloging Rules (AACR2) 
discusses how to record the frequency of a serial and
how to make notes on changes in frequency in rule

RDA instructs on making notes on changes in frequency
in and  Frequencies and their
respective dates should be entered in chronological 
order.  If the changes have been numerous, a general
note such as "Frequency varies" should be entered.

When the frequency of a serial changes, the current 
frequency is entered into the 310 tag. The former 
frequency is moved from the 310 tag to a new 321 tag. 
Add a new 321 tag for each change in frequency. 

Subfield a contains the statement of the former 
publication frequency. When the frequency varies in a 
predictable way add this information in parentheses 
following the former publication frequency. Subfield b 
contains the dates the former frequency began and 


First  Undefined

 blank Undefined 

Second  Undefined

 blank Undefined 

     a Former publication frequency (NR) 

     b Dates of former publication frequency (NR) 


Subfield b is preceded by a comma.

The tag does not end with a mark of punctuation unless 
the last word is an abbreviation, initial/letter, or 
other data that ends with a mark of punctuation.


     310    _aDaily (except Monday),
               _bMay 1917-
     321    _aEvery other day,
               _bMar. 1916-May 1917
     321    _aThree times a week,
               _bDec. 1915-Mar. 1916

     310    _aMonthly,
     321    _aQuarterly,

     310    _aBiweekly,
               _bMay 11, 1937-Oct. 19, 1971
     321    _aMonthly,
               _bJan.-May 1937

     310    _aMonthly,
               _bSept. 1903-May 1913
     321    _aWeekly,
               _bJan. 1902-July 1903

A serial that has changed frequency many times.

     310    _aBimonthly,
               _bNov./Dec. 1991-
     321    _aFrequency varies