During his busy career he had found time not only for hunting and exploring expeditions—including exploration (1913) of the River of Doubt (now called the Roosevelt River or Rio Teodoro) in the Amazon jungle—but also for writing a great number of books. They deal with history, hunting, wildlife, and politics. Among them are The Naval War of 1812 (1882), biographies of Thomas H. Benton (1887) and Gouverneur Morris (1888), The Winning of the West (4 vol., 1889–96), African Game Trails (1910), The New Nationalism (1910), Progressive Principles (1913), Through the Brazilian Wilderness (1914), and his important autobiography (1913).
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