Information that documents changes in the application of a 1XX heading.
Most often used to indicate date of adoption.
Subfield Codes
$a - Application history note (NR)
In UNBIS, the entire note is recorded in subfield $a.
Examples:
688 $a Instituted November 1991.
688 $a TOTAL QUALITY MANAGEMENT instituted July 1996.
Term changed to QUALITY MANAGEMENT Feb. 2004
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