It currently contains over 20,000 books. Books must be out of U.S. copyright to be included, which currently means 50 years after the death of the author. The Gutenberg-e books represent the most distinguished and innovative scholarship delivered with creative and thoughtful use of digital technology. These books have undergone a rigorous academic review process by distinguished historians brought together by the American Historical Association and produced in collaboration with the electronic publishing staff at Columbia University Press
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