• Machu Picchu: A Citadel of the Incas, Report of the Explorations and Excavations made in 1911, 1912 and 1915 under the auspices of Yale University and The National Geographic Society
  • The Story of American Democracy
  • The Alphabet and Elements of Lettering, Revised and Enlarged with Many Full-Page Plates and Other Illustrations Drawn and Arranged by the Author
  • Admiral of the Ocean Sea: A Life of Christopher Columbus
  • Civilization Past and Present, A Survey of the history of man … from the earliest times to the present, in Europe, in Asia, and in the Americas
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