Harold Thieie posted: >It would be equally informative if the numbers could be generated >to illustrate the size of this problem [wrong ISBNs]. Sorry can't help you there. The SLC database has 020$z for repeated ISBNs, erroneous ISBNs, and for print ISBNs in e-book records. We should have had different subfields for the different categories, but did not. In each case, we enter the 020$z ISBN as a search key. __ __ J. McRee (Mac) Elrod ([log in to unmask]) {__ | / Special Libraries Cataloguing HTTP://www.slc.bc.ca/ ___} |__ \__________________________________________________________