----------------------------Original message---------------------------- Being depository library for The Netherlands we shelve all materials in its originals form. To prevent the unlinking of a cataloguing record with the material we put as well shelf-number as CCK-record number (in your case OCLC-record number) on the material. This is done with every separate item in case somebody in future gets it into his/her head to shelve the materials in another way, e.g. separating cover from map. Jan Smits Map Curator Koninklijke Bibliotheek, National Library of The Netherlands [log in to unmask]