072 Subject Category Code

Field definition and scope:

Field 072 contains a code for the subject category that is associated with the 1XX field in an established heading record or a node label record. The code indicates the relative position of the heading in a particular hierarchical arrangement in the thesaurus specified by the value in the second indicator position or in subfield $2 (Code source). Field 072 is repeated for each location of the heading in a specific thesaurus and for multiple subject category codes when a heading is common to different thesauri.

The National level record requirement for this field is Optional.

Field 072 is repeatable.

Guidelines for applying content designators:

For indicator and subfield code definitions and examples, National level (NLR) record requirements, and designator repeatability, see table below:

Position	Description	NLR	Repeatability
Field 072	Subject Category Code	O	R
Indicator:
First	Undefined; contains a blank	M

Second	Code source	M
#	No information provided	A
0	National Agricultural Library subject category code list	A
7	Source specified in subfield $2	A

Subfield code:
$a	Subject category code	M	NR
$x	Subject category code subdivision	A	R
$2	Code source	A	NR
$6	Linkage	A	NR
$8	Field link and sequence number	O	R

LC Guidelines:

072 Subject Category Code