040 - Cataloging Source - MARC
Add subfield $d {MARC 21 code} when modifying NARs or SARs unless your institution's is already the last MARC subfield $d in the 040 field.
For example if LC is modifying agency, when making revisions to a NAR, we should add a $d DLC to the 040, if that is not the latest subfield present.
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