Francis Parkman, La Salle and the Discovery of the Great West, pp. 39-40, Note 2. Boston, 1904.

George G. Chisholm, Commercial Geography, pp. 56-57. London, 1904.

Herodotus, Book II, 60.

Encyclopædia Britanica, Article Pilgrimages.

E. Huntington, The Pulse of Asia, p. 88. Boston, 1907.

Boyd Alexander, From the Niger to the Nile, Vol. II, pp. 3-7. London, 1907.

C.A. Sherring, Western Tibet and the British Borderland, pp. 3-4, 144-145, 280-284. London, 1906.

Hans Helmolt, History of the World, Vol. I, pp. 189-191. Map p. 190. New York and London, 1902-1906.

J.W. Powell, Map of Linguistic Stocks of American Indians, Annual Report of Bureau of Ethnology, Vol. VII.

Archibald Little, The Far East, Ethnological Map, p. 8. Oxford, 1905.