Authority 070 szerkesztése (szakasz)

== FIELD DEFINITION AND SCOPE ==


:Call number assigned by the National Agricultural Library (NAL) to 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).

:Used only for class numbers and call numbers assigned by NAL. May also contain NAL accession numbers for visual materials.

: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.