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Math Ebooks Sites
American Institute of Mathematics Open Textbook InitiativeThe American Institute of Mathematics (AIM) seeks to encourage the adoption of open source and open access mathematics textbooks. The AIM Editorial Board has developed evaluation criteria to identify the books that are suitable for use in traditional university courses. The Editorial Board maintains a list of Approved Textbooks which have been judged to meet these criteria.
Repository of freely downloadable mathematical works in progress hosted by the American Mathematical Society. It contains draft works include course notes, textbooks, and research expositions in progress.