070 National Agricultural Library Call Number

Field definition and scope:

Field 070 contains a National Agricultural Library (NAL) call number for a series when all or part of the series is classified as a collected set or with the main series (646 Series Classification Practice, subfield $a, code c or m).

Field 070 is used only for class numbers and call numbers assigned by the National Agricultural Library (NAL).

This field may also contain NAL accession numbers for visual materials.

Field 070 may also contain the volumes/dates to which the number applies. Varying numbers for different ranges of volumes/dates within a series are contained in separate 070 fields.

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. Both schemes are still used because some series title changes have been kept with the USDA scheme call number.

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) record requirements, and designator repeatability, see table below:

Position	Description	NLR	Repeatability
Field 070	National Agricultural Library Call Number	O	R
Indicator:
First	Undefined; contains a blank	M
Second	Undefined; contains a blank	M

Subfield code:
$a	Classification number	M	NR
$b	Item number	A	NR
$d	Volumes/dates to which call number applies	current - O earlier - M	NR
$0	Authority record control number or standard number		R
$1	Real World Object URI		R
$6	Linkage	A	NR
$8	Field link and sequence number	O	R

Input conventions:

Order

Capitalization

Content designator history:

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

Subfield $1 - Real World Object URI [new, 2017]

LC Guidelines:

070 National Agricultural Library Call Number