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  1. History of the United States : Beard, Charles A. (Charles Austin), …

  2. History of the United States by Charles A. Beard and Mary Ritter …

  3. The Project Gutenberg eBook of History of the United States, …

  4. 15+ U.S. History Books for Free! [PDF] - InfoBooks.org

  5. U.S. History - Open Textbook Library - Center for Open Education

  6. CKHG: A History of the United States - Core Knowledge

  7. The American odyssey : a history of the United States

  8. U.S. History - OpenStax