First, create a column to indicate if you have read/not read a book. There are multiple threads on here to do so. Most of us just indicate we've read it by giving it a 1-5 star rating (it's OUR library after all). Since my library is accessed by multiple family members, I have a separate column for me with a check mark for items I have read since sometimes when I import from Amazon, it comes with a star rating (why is that? I don't know).
Second, there is a plug in that will sort out duplicates in your library. Don't recall if it was free or not, but it is quite worthwhile when you have a LOT of ebooks. It's called "Find Duplicates".
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