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Actually, you don't have to sort in order of last opened. You can sort by Title or Author, too (Sort options at the top of the Home page).
If it is a book from Amazon, if you delete it, you can always re-download it. If deleted from the Kindle, it will still show up in your Archives. Or, if not from Amazon, you can back it up to your computer, and restore later.
It is pretty much either going to be on the Kindle, or not.
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