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Gibbon, Lardner and Wm. L. Herndon: Exploration of the Valley of the Amazon. Washington, 1854.

Hale, Albert: The South Americans. Indianapolis, 1907.

Keane, A. H.: South America; comprising a volume of Stanford’s compendium of geography and travel. London, 1901.

Kerbey, J. Orton: The Land of To-morrow. A newspaper exploration up the Amazon and over the Andes. New York, 1906.

Markwick, W. Fisher: The South American Republics. New York, 1901.

Martin, Percy F.: Through Five Republics of South America. London, 1906.

Mathews, Edward D.: Up the Amazon and Madeira Rivers. London, 1879.

Orton, James: The Andes and the Amazon; or, Across the Continent of South America. New York, 1870.

Ruhl, Arthur: The Other Americans. New York, 1907.