The former publication frequency of either an item or an update to an item. Use only when a current publication frequency is given in
field 310.
If a record has multiple 321 fields, delete them when you add a Frequency varies note.
Use the following guidelines for capitalization, punctuation, and representation of numerals so that the current and former frequencies print correctly:
Capitalize the first letter of the first word in subfield ‡a.
Enter a comma between subfields ‡a and ‡b.
Do not enter final punctuation unless the field ends with an abbreviation.
If the first 321 field begins with a number and if
field 310 is also present, spell out the number in the first 321 field.
310
4 issues yearly, ‡ b Aug 1904-
321
Five issues yearly, ‡ b 1901-June 1904
Enter each former frequency in a separate 321 field. Enter the former frequencies in the order of earliest to most recent.
Spell out a number appearing in the first 321 field only. Use an Arabic numeral in subsequent 321 fields.
310
Monthly, ‡ b 1949-1956
321
Five issues yearly, ‡ b 1947
321
14 issues yearly, ‡ b 1948
1st Indicator
Undefined. The 1st indicator position is undefined and contains a blank ( ).
Undefined
2nd Indicator
Undefined. The 2nd indicator position is undefined and contains a blank ( ).
Undefined
Subfields
‡a Former publication frequency
The complete statement, exclusive of dates, of the former publication frequency.
‡b Dates of former publication frequency
The dates of the former publication frequency.
321
Monthly, ‡ b 1957-1962
321
Bimonthly (irregular), ‡ b 1964-1967
Printing
The current and former frequencies (
field 310 and field 321) print as the first note. See
field 310 for more information.
圖書館員的工具箱:
