I've discovered that due to a mistake a long time ago we have a large number of duplicate biblio records in our system... as much as a third of our database, or possibly even more. This is old enough that the import marc batches have long been cleaned. The good news is these duplicates are mainly for e-Books licensed through EBSCO, where we just have the bibliographic record and an 856u field, with no items or circulation. If I could construct an SQL query to identify the duplicate biblionumbers (excluding an original record for each item), would it be enough to delete database records from the items, biblioitems, and biblios tables, and then fully re-index Zebra to clean these up? Joel Coehoorn Director of Information Technology 402.363.5603 *jcoehoorn@york.edu <jcoehoorn@york.edu>* The mission of York College is to transform lives through Christ-centered education and to equip students for lifelong service to God, family, and society