If these are Amazon ebooks, deleting them only removes them from memory. They are still available on Amazon's server. In the Content Manager, they show up as "Amazon" and you can you can transfer them back to "Kindle" or "SD Card" at any time Whispernet is up. They can also be re-downloaded via a PC, and I typically save a copy on my PC anyway.
Most ebooks without DRM (Baen, FictionWise, FeedBooks, ...) can also be re-downloaded from the provider, but it is again a good idea to save a copy on your PC.
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