Classification/Cataloging Update (CC): Represents Superintendent of Documents (SuDoc) classification number changes
What Happened to? (WH): Represents miscellaneous information (e.g., delays in distribution, production/publishing issues) that may be useful to depository coordinators as they maintain their depository collections. This category is used infrequently.
Updates to the List of Classes, New Items (UN): Represents new depository item numbers that have been recently created and added to the List of Classes.
Updates to the List of Classes, Misc. (UM): Represents miscellaneous updates to the List of Classes (e.g., title changes, discontinued or inactivated depository item numbers or SuDoc classification numbers).
