Library of Congress >> MARC >> Authority >> 01X-09X >> 073

073 - Subdivision Usage (NR)

MARC 21 Authority - Full

October 1999

First Indicator
Undefined
# - Undefined

Second Indicator
Undefined
# - Undefined


Subfield Codes
$a - Subdivision usage (R) $z - Code source (NR)	$6 - Linkage (NR) $8 - Field link and sequence number (R)

FIELD DEFINITION AND SCOPE

Code specifying the topical term or geographic name with which the 1XX heading in a subdivision record may be used in a particular thesaurus.

Appropriate only in a subdivision record or an established heading and subdivision record. The code may correspond to all or a portion of the subject category code contained in field 072 (Subject Category Code) in an established heading record for a topical term or geographic name.

GUIDELINES FOR APPLYING CONTENT DESIGNATORS

■ INDICATORS

Both indicator positions are undefined; each contains a blank (#).

■ SUBFIELD CODES

$a - Subdivision usage

Category designator code that specifies the category of terms with which the subdivision may be used.

$z - Code source

MARC code that identifies the thesaurus used to assign the category designator code. Code from: MARC Code Lists for Relators, Sources, Description Conventions.

$6 - Linkage

See description of this subfield in Appendix A: Control Subfields.

$8 - Field link and sequence number

See description of this subfield in Appendix A: Control Subfields.

■ EXAMPLES

In the following example, the subdivision utilization may generally be used with seven categories of terms in the MeSH system, i.e., those coded in field 073 as E1 (Diagnosis), E2 (Therapeutics), etc. The topical term heading Mental Health Services is in categories F4 (Disciplines, Tests, Therapy, Services) and N2 (Facilities, Manpower and Services). The category designator N2 in field 073 subfield $a of the subdivision record and the subject category code N2 in field 072 subfield $a of the established heading record provide a link between the subdivision utilization and the topical term heading Mental Health Services.


008/09	d [subdivision record]
008/11	c [code indicating MeSH]
180	##$xutilization
073	##$aE1$aE2$aE3$aE4$aE6$aE7$aN2$zmesh


008/09	a [established heading record]
008/11	c [code indicating MeSH]
150	##$aMental Health Services
072	##$aF4.$x408
072	##$aN2.$x421.$x461

Library of Congress >> MARC >> Authority >> 01X-09X >> 073

(03/03/2008)