Influences of Geographic Environment On the Basis of Ratzel's System of Anthropo-Geography
Book V, chap. VI, 6, 7.
[459] Helmolt, History of the World, Vol. I, pp. 188-189, 193-195. New York, 1902-1906.
[460] Strabo, Book XVI, chap. III, 4, 27. Herodotus, Book I, chap. I;