If you have access to a U.S. public library, many have ebooks in both pdf and epub formats. Your pocketpro will read both of those formats.
Most of the book stores have epub or multi-format ebooks that should also work on your PocketPro. For more free books, of course right here at MR there are more than 10,000 classics. Feedbooks also carries free ebooks in a multiple formats.
Hope this helps.
cheers
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