Thucydides, I, 110. Brugsch-Bey, History of Egypt, Vol. II, p. 333. London, 1881.

John Richard Green, History of the English People, Vol. I, chap. III, p. 71.

Miller and Skertchley, The Fenland Past and Present, pp. 83, 101, 104, 107, 108. London, 1878.

Tacitus, History of the Germans, Book VI, chap. VI. Motley, Rise of the Dutch Republic, Vol. I, pp. 2-5, 13. New York, 1885.

J. Partsch, Central Europe, p. 299. London, 1903.

Miller and Skertchley, The Fenland Past and Present, pp. 113-114. London, 1878.

Edward John Payne, History of the New World Called America, Vol. I, pp. 327-328, 502-503. Oxford, 1892. Ratzel, History of Mankind, Vol. II, p. 163. London, 1896-1898.

U.S. Report of Commission of Navigation, p. 10. Washington, 1901.