Here are instructions on how to add free ebooks from Project Gutenberg to your Kindle. Comment below with what kind of books you like to read and I'll try to recommend something. :
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Download Project Gutenberg Books to a Kindle - E-books at Briggs Library - LibGuides at South Dakota State University
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Download Project Gutenberg Books to a Kindle - E-books at Briggs Library - LibGuides at South Dakota State University