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There's a utility which will convert the PDF files to ePub format. You can read about it on the How-to Geek site at http://www.howtogeek.com/howto/19217/.
Also there's a big wiki article at http://wiki.mobileread.com/wiki/E-book_conversion which shows many other options for converting other files to ePub.
For other options,just google "pdf files to ebook format".
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