321 Former Publication Frequency (R) (Variable Data Field)
Field 321 contains the former publication frequency of an item. It is used only when a current publication frequency is given in field 310 (Current Publication Frequency) .
The phrase frequency varies may be used in field 321 when more than three past frequencies are known. If subfield $a contains the phrase frequency varies, subfield $b contains the inclusive date for the frequencies.
The National level record requirement for this field is Optional.
Field 321 is repeatable .
Guidelines for applying content designators:
For indicator and subfield code definitions and examples, National-level (NLR) and Minimal-level (MLR) record requirements , and designator repeatability , see table below:
Position | Description | NLR | MLR | Repeatability |
Field 321 | Former Publication Frequency | O | O | R |
Indicator: | ||||
First | Undefined; contains a blank | M | ||
Second | Undefined; contains a blank | M | ||
Subfield code: | ||||
$a | M | O | NR | |
$b | A | O | NR | |
$6 | A | O | NR | |
$8 | O | O | R |
Related MARC fields or documents:
310 Current Publication Frequency
880 Alternate Graphic Representation
See also:
3XX Physical Description, Etc. Fields
