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What device do you have the book on? a Kindle e-reader? if so, of what model, please?
Thanks for the response and the information. One moment please...
Try this procedure:
Get a list of Titles on your Nook on the screen.
Tap and hold on the title you would like to delete
Tap on Delete.
Tap on the following Delete button again, to confirm the deletion.
Does that work?
At what point in the instructions does it fail, please?