070 Subfield $a - Classification number:

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

Examples:

070 0#$aHD3492.H8$bL3

070 0#$aTRANSL$b17828

[Number assigned to a translation.]