MARC 21 Format for Bibliographic Data: 070: National Agricultural Library Call Number (Network Development and MARC Standards Office, Library of Congress)

Classification or call number that is assigned by the National Agricultural Library (NAL).

Prior to 1965, NAL used a USDA library classification scheme. In 1965, NAL began using the Library of Congress Classification for all newly-cataloged materials. Serial-like items have retained the old call number whenever possible; thus, both schemes are still in use. NAL also assigns sequential accession numbers to dissertations and abstracts.

Prefixes may occur in NAL call numbers. "A" specifies a USDA publication in the old USDA scheme; "a" specifies a USDA publication in the LC classification scheme; "R" specifies a rare book; "J" specifies a juvenile book; and "Fo" specifies a folio publication.

GUIDELINES FOR APPLYING CONTENT DESIGNATORS

■ INDICATORS

First Indicator - Existence in NAL collection

Whether or not the item is contained in the NAL collection.

0 - Item is in NAL

1 - Item is not in NAL

Second Indicator - Undefined

Undefined and contains a blank (#).

■ SUBFIELD CODES

$a - Classification number

Classification number portion of the NAL call number. Subfield $a is repeated to record alternative classification numbers.


070	0#$aHD3492.H8$bL3
070	0#$aTRANSL$b17828 [Number assigned to a translation.]

$b - Item number

NAL item number.


070	0#$a281.9$bC81A [Number assigned from the USDA library scheme.]
070	0#$aQH301.A5 $b1981 [Number assigned from the LC classification scheme.]

$8 - Field link and sequence number

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

INPUT CONVENTIONS

Punctuation - Field 070 does not end in a period unless the field ends in an abbreviation, initial/letter, or other data that ends in a period.

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

CONTENT DESIGNATOR HISTORY

Indicator 2 - Series call number (SE) [OBSOLETE]
In the serials specifications, the use of the second indicator position to indicate the type of series was made obsolete in 1976. The values were: 0 (No series involved), 1 (Main series), 2 (Subseries), 3 (Sub-subseries).

070 - National Agricultural Library Call Number (R)

FIELD DEFINITION AND SCOPE

GUIDELINES FOR APPLYING CONTENT DESIGNATORS

■ INDICATORS

■ SUBFIELD CODES

INPUT CONVENTIONS

CONTENT DESIGNATOR HISTORY


Subfield Codes
$a - Classification number (R) $b - Item number (NR)	$8 - Field link and sequence number (R