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→Notes on Field Contents
:d = Integrating resource
:Bibliographic item/resource that is added to or changed by means of updates that do not remain discrete and are integrated into the whole. :Integrating resources may be finite or continuing.
:The following are examples of materials that are coded "d": updating loose-leafs, databasesand updating Web sites.
:u = Holdings type unknown
'''7 Type of unit designator'''