This has always been an issue ... even with paper books ... I read A LOT, as I'm quite sure most of you do.
I check out books from the library 10 at a time. paper or ebooks.
When I went to the library and got paper books, I could generally tell if I'd read it before because I could read the first few pages ...
With ebooks, I don't have that ability. Certainly not a big deal if I check something out that I read a year ago, I can return it and get something else ...
But, do you have a system for keeping track?
Luckily, Amazon and Barnes & Noble will tell me if I already own a book, but my library won't tell me if I've already checked a book out ....
I suppose a spread sheet ... but that just seems awfully nerd-y and my kids will tell you I'm nerd-y enough, thank you very much

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I also guess I could just not delete the books from ADE after they expire ... then I'd know if there were duplicates ... but, again, that will eventually be 100's of books that I can't read again (expired) taking up space on my hard drive ...
Thoughts?