Field definition and scope:

Field 070 contains either a complete National Agricultural Library (NAL) call number or an NAL classification number.  Field 070 is used only for class numbers and call numbers assigned by NAL.  This field may also contain NAL accession numbers for visual materials.

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.

The National level record requirement for this field is Optional.

Field 070 is repeatable.

Guidelines for applying content designators:

For indicator and subfield code definitions and examples, National-level (NLR) and Minimal-level (MLR) record requirements, and designator repeatability, see table below:

Position

Description

NLR

MLR

Repeatability

Field 070

National Agricultural Library Call Number

O

O

R

Indicator:

 

 

 

 

First

Existence in NAL collection

M

 

 

#

No information provided

A

 

 

0

Item is in NAL

A

 

 

1

Item is not in NAL

A

 

 

 

 

 

 

 

Second

Undefined; contains a blank

M

 

 

 

 

 

 

 

Subfield code:

 

 

 

 

$a

Classification number

M

O

R

$b

Item number

A

O

NR

$0

Authority record control number or standard number

O

O

R

$8

Field link and sequence number

O

O

R

Input conventions:

Punctuation

Capitalization

Content designator history:

First Indicator - Existence in NAL collection

Value # - No information provided  [new, 2017]

Second Indicator - 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), and 3 (Sub-subseries).

Subfield $0 - Authority record control number or standard number  [new, 2017]

Related MARC fields or documents:

Library of Congress Classification

USDA Library Classification Schedules

See also:

0XX  Numbers and Codes

Variable Data Fields