Stoddard, James, The Seven Sagas of Prehistoric Man. London: Chatto & Windus.
Taylor, Isaac, Origin of the Aryans. New York: Charles Scribner’s Sons.
Tylor, E. B., Anthropology. New York: D. Appleton & Co.
Waterloo, Stanley, The Story of Ab. New York: Doubleday, Page & Co.
Wilson, Sir Daniel, Prehistoric Man. New York: The Macmillan Company.
Wright, G. F., Man and the Glacial Period. New York: D. Appleton & Co.
Worsæ, J. J. A., Industrial Arts of Denmark. London: Chapman & Hall.
2. Magazine Articles.
Barton, Julien, and Sheppard, W. L., “Eighty Miles in Indiana Caves,” Scribner’s Magazine, Vol. XIX., pp. 875-888.