Dublin Core Definition:	An unambiguous reference to the resource within a given context.
MARC:	024 8_ |2 Accession number |a 024 8_ |2 Photo CD Number |a 024 8_ |2 Location number |a

18.1  Use this field to enter the identification numbers of the originals and the photo CD files for easy retrieval.

024	8_ |2 Accession number |a UC17-0597
024	8_ |2 Photo CD Number |a IMG0077-1012
024	8_ |2 Location |a Box Greenwich-, ff Hampton/Chaplin

024	8_ |2 Accession number |a X.2000.1.319
024	8_ |2 Photo CD number |a 2801 img0034.pcd

024	8_ |2 Accession number |a 1976.161.3
024	8_ |2 Photo CD number |a img0083-3152.pcd