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userwack - if it's just a format issue, and I saw any value in knowing the different ISBN values for the different formats, then I would record it in my Notes custom column, like so:
Code:
PDF ISBN - 1234567890123
EPUB ISBN - 2345678901234
But if I have two versions with different ISBN's chances they'll be in the same format. In that case I have a different problem, what to do with multiple format files of the same type for the same book. There are a number threads on that in this sub-forum.
BR