First indicator:

#  Undefined

Second indicator - Code source

0  National Agricultural Library subject category code list

7  Source specified in subfield $2


a  Subject category code (NR)

x  Subject category code subdivision (R)

2  Source (NR)

6  Linkage (NR)

8  Field link and sequence number (R)

NOTE:  See MARC 21 Format for Bibliographic Data (072 Subject Category Code) for code definitions not given below.


Field 072 contains a code for the subject category that is associated with an item.

Second indicator - Code source

The second indicator specifies the source list of the code.

0    National Agricultural Library subject category code list.

Value "0" indicates that source of the subject category code is AGRICOLA Subject Category Codes with Scope Notes which is maintained by the National Agricultural Library.

072 #0 A000

7    Source specified in subfield $2.

Value "7" indicates that the source of the subject category code is specified in subfield $2.

072 #7 E5 $x .510 $2 mesh


$a  Subject category code.

The code is input in subfield $a.  Subfield $a is not repeatable in MARC 21, but is repeatable in OCLC.  When more than one code has been input on an OCLC record, separate 072 fields can be used if needed for local system validation.

072 #0 K100 $a L001 $a L821

[Can be changed to:]

072 #0 K100

072 #0 L001

072 #0 L821

$x  Subject category code subdivision.

Subfield $x is used when the structure of the source list being used provides subject category code subdivisions.

072 #7 Z1 $x .630 $2 mesh

$2  Source.

Subfield $2 is used only when the second indicator is set to value "7".  This subfield contains a code identifying the source list from which the subject code was assigned.  Codes are assigned from the Source Codes for Vocabularies, Rules, and Schemes (Subject Category Code Source Codes).

072 #7 17 $x 02.1 $2 cosatisc

Related fields, etc.

072 Subject Category Code  (MARC 21 Format for Bibliographic Data)

See also:

01X-09X  Numbers and Codes

Variable Data Fields

Section E.  MARC 21 Format for Serials as Applied Within CONSER

CONSER Editing Guide:  Contents