----------------------------Original message---------------------------- In the library to which I referred (University of Utah Marriott Library), the book and map carry the same index number. The library employs the Library of Congress system, so I don't think the numbers will be changed in the near future. This reference system will help to avoid the problem that Andrew Cook identifies. The online card catalog indicates that there is a map stored at a different location, or, the user will know instantaneously that the map is somewhere else because the pocket is empty. For a person unacquainted with the filing system, it takes only one time asking the librarian what happened to the map to be introduced to their storage location. Incidentally, I am not a map librarian, but a map library user. _________________________________ Paul R. Larson. Ph.D. Assistant Professor, Geography Physical Science Department Southern Utah University Cedar City, Utah 84720 tel: (801) 865-8244 fax: (801) 865-8051 E-mail [log in to unmask] __________________________________