I am guessing that most of the books you have are EPUb and many are DRMed EPub. You are going to have to convert the non DRMed EPubs using something like Calibre and sideload the books using the USB cord. You will have to decide if you want to strip the DRM from the DRMed books. If you chose to do so, you will have to convert the stripped files to put them on your K3.
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