Correspondence, diaries, writings, subject files, and other papers relating chiefly to Bonsal's career as a journalist and as foreign correspondent for the New York Herald and New York Times. Documents his role as confidential interpreter for President Woodrow Wilson and Edward Mandell House at the Paris Peace Conference, 1919-1920, and as secretary of the U.S. Legation, Tokyo, Japan, 1895. Subjects include Japanese culture, customs, politics, and relations with the United States; the Spanish-American War, especially in Cuba and the Philippines; the Santiago Campaign, Cuba, in 1898; Mexican president Porfirio Díaz and the Mexican Revolution, 1910-1920; the American-Mexican Joint Commission, 1916; American ambassador Henry Lane Wilson's views on Mexico; World War I; national political affairs; Otto Fürst von Bismarck, Franklin D. Roosevelt, Edith Bolling Galt Wilson, and other contemporaries; Bonsal's friendship with House, Georges Clemenceau, and Hendrik Willem Van Loon; literature; and Bonsal's travels. Correspondents include James Truslow Adams, Newton Diehl Baker, Bernard M. Baruch, James Stuart Douglas, Arthur Hugh Frazier, Hugh Gibson, Francis Burton Harrison, Edward Mandell House, Hendrik Willem Van Loon, and Henry Lane Wilson.