You just connect the Kindle via USB, and move the books to an appropriate directory (folder). I don't know what the folder name is for the Fire. For an e-ink Kindle, it is the documents folder.
Edited to add: I think that possibly a lot of books from Amazon, if not all, for the Fire are not able to be transferred via USB. But you mentioned books from other sources, so I answered that.
Last edited by susan_cassidy; 07-16-2013 at 07:55 PM.
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