A feasibility study for the retrospective conversion of the Dutch Union Catalogue

The union catalogue of monographs published before 1976 is maintained by the Dutch National Library in card form and contains five to six million records from 95 libraries. The extent to which these records need to be converted into machine‐readable form depends on several factors. Does the holding library still exist? Does the holding library participate in the Pica shared cataloguing system and has it converted its own card catalogue? Did the holding library convert its card catalogue using another library system? Are the cards in the union catalogue still reliable or did the holding library discard volumes from its collection without notifying the National Library? A feasibility study showed that the holding data of 59 libraries could be removed without any further processing; this amounts to 72.6 per cent of the cards. For the remaining 27.4 per cent of the cards from 36 libraries, priorities for the retrospective conversion of their data in the union catalogue were determined.