Can't remove book titles from the Google Play Books app library
Our team has identified an issue with the app where if you try to remove a book from your device (using the option "Remove from my library"), it will automatically re-download to your device a little while later. You may even see that the book has been removed from your library on the web (under "My Books" at play.google.com/books), but that the book stays on your device. Our engineers are investigating this issue and working on a resolution. If you should require further support, please contact us.