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OpenStax College, the year-old Rice University startup that produces free online textbooks, will more than double the number of fields in which it has titles by 2015, the university announced today. A grant from the Laura and John Arnold Foundation will allow OpenStax College to add to its current offerings in physics and sociology, and its two new biology books and an introductory anatomy text coming out this fall. The new titles will be in precalculus, chemistry, economics, U.S. history, psychology and statistics, Rice said, toward its goal of producing high-quality open-source books in the 25 most-enrolled college courses. OpenStax says its existing two texts have been downloaded more than 70,000 times so far.