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  1. Fundamentals of Mathematics - Open Textbook Library

  2. 20+ Arithmetic Books for Free! [PDF] - InfoBooks.org

  3. 460 Free Textbooks – Math, Science, and More [Online PDF for …

  4. The Higher Arithmetic: An Introduction to the Theory of Numbers

  5. 50+ Mathematics Books for Free! [PDF] - InfoBooks.org

  6. Free Contemporary Mathematics Book for Download - OpenStax

  7. City University of New York

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