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"Apple is making big moves today in the textbook world, offering books that cover 5 years of subject matter for a mere $15 each. Announced at an event in New York City today, the company ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/apple/2012/01/19/apples-new-textbooks-are-live-and-you-can-get-them-right-now/>