MARC 21 Format for Authority Data: 053: LC Classification Number (Network Development and MARC Standards Office, Library of Congress)

Single LC classification number or a number span associated with a 1XX heading in an established heading record or a subdivision record. Source of the classification number is Library of Congress Classification and/or the LC Classification Additions and Changes that are maintained by the Library of Congress. The hyphen (-) between the two class numbers in a range of numbers may be generated based on the presence of both subfields $a and $b.

Classification number(s) may be qualified by a descriptive term when the heading is represented in more than one place in the LC classification schedules. Each classification number or number span associated with a heading is contained in a separate 053 field.

Organizations may conform to Library of Congress practice by applying Subject Cataloging Manual: Classification conventions.

GUIDELINES FOR APPLYING CONTENT DESIGNATORS

■ INDICATORS

Second Indicator - Source of classification number

Whether the source of the classification number is the Library of Congress or another organization.

0 - Assigned by LC

4 - Assigned by agency other than LC

MARC code for the organization is contained in subfield $5.


053	#4$aQH198.H3$5DI

■ SUBFIELD CODES

$a - Classification number element-single number or beginning number of span


100	1#$aGrimes, Martha
053	#0$aPS3557.R48998


130	#0$aBook of Mormon$xAntiquities
053	#0$aBX8627


180	##$xRhetoric
053	#0$aP301$cLinguistics

$b - Classification number element-ending number of span

Ending number of number span when the beginning number of the span is contained in subfield $a.


151	##$aUnited States$xHistory$yRevolution, 1775-1783
053	#0$aE201$bE298

$c - Explanatory term

Descriptive term or phrase that specifies the topic of the classification number. Normally, such a phrase is used to differentiate between two or more class numbers associated with the heading. The parentheses that enclose the phrase or term may be generated for display.


150	##$aString quartets
053	#0$aML1160$cHistory
053	#0$aMT728$cInstruction and study


110	2#$aCatholic Church$xHistory$vSources
053	#0$aBX850$bBX875$cDocuments

$5 - Institution to which field applies

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


053	#4$aHD1694.S6$5DI

INPUT CONVENTIONS

Capitalization - Alphabetic characters in the classification number portion of the field are generally uppercase.

Spacing - Any spaces that are desired as part of the call number must be input.

Display Constants

-	[hyphen associated with the content of subfield $b]
( ... )	[parentheses associated with the content of subfield $c]

Hyphen between the two class numbers in a number span in subfields $a and $b and parentheses that may enclose the explanatory term in subfield $c are not carried in the MARC record. They may be system generated as display constants associated with the content of subfields $b and $c, respectively.


	Content designated field :
053	#0$aBX850$bBX875$cDocuments
	Display example:
	BX850-BX875 (Documents)

CONTENT DESIGNATOR HISTORY

Indicator 2 - Source of Classification Number [NEW, 1995]
Prior to 1995, field 053 was an agency-assigned field and contained only classification numbers assigned by the Library of Congress.

053 - LC Classification Number (R)

FIELD DEFINITION AND SCOPE

GUIDELINES FOR APPLYING CONTENT DESIGNATORS

■ INDICATORS

■ SUBFIELD CODES

INPUT CONVENTIONS

CONTENT DESIGNATOR HISTORY


Subfield Codes
$a - Classification number element-single number or beginning number of span (NR) $b - Classification number element-ending number of span (NR) $c - Explanatory term (NR)	$5 - Institution to which field applies (R) $6 - Linkage (NR) $8 - Field link and sequence number (R)