Hi, MaineDruid, and welcome to EYB! The "duplicate" titles you're seeing in the EYB Library are different editions of the same book, with different ISBN's, which EYB lists separately until a title is assigned to one of our pro indexers or to an EYB member for indexing. Upon assignment, we designate the print edition being indexed as the "master" and link to it all the various editions that are otherwise identical for indexing purposes. Those linked editions can be viewed in the Library by clicking on the chain-link icon (next to the "people" icon indicating the number of member Bookshelves) to display the ISBN, format, and country of publication for each edition. When searching the EYB Library for your books, be sure to expand the linked editions and select the ISBN of the edition you own to add to your Bookshelf. Or use the Import Books feature to add books to your Bookshelf by ISBN. We don't delete books from the Library even if they're not indexed, otherwise members wouldn't be able to add their specific edition of a title to their Bookshelf.