• A Life of Napoleon Bonaparte, with a Sketch of Josephine, Empress of the French.
• All in the Day's Work: An Autobiography
• He Knew Lincoln
• He Knew Lincoln, and Other Billy Brown Stories
• Madame Roland: A Biographical Study
• Peacemakers—Blessed and Otherwise: Observations, Reflections and Irritations at an International Conference
• The Business of Being a Woman
• The early life of Abraham Lincoln:: containing many unpublished documents and unpublished reminiscences of Lincoln's early friends
• The History of the Standard Oil Company
• The Mentor: Joan of Arc, v. 3, Num. 22, Serial No. 98, January 1, 1916
• The Mentor: Napoleon Bonaparte, Serial No. 38
• The Rising of the Tide: The Story of Sabinsport
• The Tariff in Our Times