[Koha] re-importing books, duplicate barcodes

[magmatic]

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



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