072 Subfield $2 - Code source:

Subfield $2 contains a MARC code that identifies the thesaurus used to assign the subject category code when the second indicator position of this field contains value 7. The source of the MARC code is MARC Code List for Relators, Sources, Description Conventions that is maintained by the Library of Congress.

Examples:

072 #7$a17$x02.1$2cosatisc

[A COSATI subject category code.]

072 #7$aB$2lcmd