[Koha] re-importing books, duplicate barcodes

I have imported a large pile of books already. Now I'm going to import another pile, except that there are lots of duplicate books. All books have barcodes in the marc file, so I want to test for duplicity on that field. If there is a duplicate, I want to update the existing book with new information. Can anyone give me some detailed instructions on how to do this? The last time I looked, I think it was possible, but a little confusing. Thanks. -- Tim -- View this message in context: http://koha.1045719.n5.nabble.com/re-importing-books-duplicate-barcodes-tp57... Sent from the Koha-general mailing list archive at Nabble.com.