070 National Agricultural Library Call Number (R) (Variable Data Field)
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 the National Agricultural Library. 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 | M | |||
0 | A | |||
1 | A | |||
Second | Undefined; contains a blank | M | ||
Subfield code: | ||||
$a | M | O | R | |
$b | A | O | NR | |
$8 | O | O | R |
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).
Related MARC fields or documents:
Library of Congress Classification
USDA Library Classification Schedules
See also:
