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Hi All, I just wanted to see if what I am thinking makes sense to you, as fello code4libbers. I have a list of ISBNs, the catalogue of an specialist e-book vendor. I have another, shorter, list of ISBNs from our own collection, for that specialist subject. I want to see how much of an overlap there is. This is easy to do in Excel, with the VLOOKUP() function. I did that on thursday. My problem though is that there can be many different ISBNs for a single book. I want to match works, not editions, to get a better idea of coverage. This is because we are likely to have older editions of some of the works on the ebooks list. So, I am thinking of getting someone here to write a web application next week, which will do this comparison of works, not ISBNs. It will use the ThingISBN and/or XISBN APIs to make the matches. We want to make this comparison to enable us to make a purchasing decision regarding the electronic books. Thoughts? Best, David. -- David Kane Systems Librarian Waterford Institute of Technology Ireland http://library.wit.ie/ [log in to unmask] T: ++353.51302838 M: ++353.876693212