If your PDFs are DRM-free I'd convert them to ePub using something like Calibre. You'll lose the page formatting so if there are diagrams and columns it'll all go away, but as I mentioned in another thread, PDFs are designed to represent exact layout as specified by the creator and should not be mutable. That defeats the intent of a PDF and is the reason why PDF viewing on small screens is a hassle (the DX has a large enough screen that a PDF's typical letter-sized page sizes well on it).
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