USBC (Universal Standard Book Code) : its use for union file creation : a feasibility study for a national datebase / F.H. Ayres ... [et al.]. Ayers, F. H. (Frederick Henry) British Library. Bibliographic Services Division. Publishers' standard book numbers Standards Great Britain. Machine-readable bibliographic data Standards Great Britain. Book industries and trade Code numbers Standards Great Britain. Bibliography, National Databases Standards Great Britain. Union catalogs Standards Great Britain. 025.04 AYU Includes bibliography. London : British Library, Bibliographic Services Division, c1984. c1984. 1984 Text v. (various pagings) : eng Great Britain. Great Britain. Great Britain. Great Britain. Great Britain.