Alexander P. Engelhardt, A Russian Province of the North, pp. 135, 140-147, 165, 170. Translated from the Russian. London, 1899.
For full and able discussion, see H. J. Mackinder, The Geographical Pivot of History, in the Geographical Journal, April, 1904. London.
The Anglo-Russian Agreement, with map, in The Independent, October, 10, 1907.
Spencer and Gillen, The Northern Tribes of Central Australia, p. xii. London, 1904.
Census of the Philippine Islands, Vol. I, p. 526; Vol II, pp. 34-35, 50-52 and map. Washington, 1903.
Grote, History of Greece, Vol. II, pp. 225-226. New York, 1859.
W.Z. Ripley, The Races of Europe, pp. 402-410, map. New York, 1899.
Frederick J. Turner, The Significance of the Frontier in American History, in the Annual Report of the American Historical Association for 1893, pp. 199-227. Washington, 1894.
Hugh R. Mill, International Geography, pp. 150-152. New York, 1902.
W.E. Griffis, The Mikado's Empire, Vol. I, pp. 75, 83. New York, 1903. Henry Dyer, Dai Nippon, pp. 59, 69. New York, 1904.