Many websites offer free downloadable e-books. You can check out the Harker Heights Public Library's "Central Texas Digital Library" at www.ctdl.lib.overdrive.com or visit one of the following sites that contain items that you can download and keep in your eReaders and other reading devices. Make sure that you check the sites to determine how to download the materials to your individual device.
http://www.archive.org/details/texts
http://www.gutenberg.org/
http://www.barnesandnoble.com/u/Free-eBooks/379003078/
http://www.amazon.com/b?ie=UTF8&node=2245146011
http://ebookstore.sony.com/category/free-ebooks
http://books.google.com/ebooks (then search for free)