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Project Gutenburg is a database containing books that are either free in the United States because their copyrights have expired, or are copyrighted works that the authors have given permission for them to be distributed freely, in non-commercial means. It also contains a variety of written and recorded music. You may copy it, give it away or re-use it under the terms of the Project Gutenberg License included with this eBook or online at www.gutenberg.org." It has a wide variety of materials that could be of use as supplemental materials to an equally wide variety of courses.