Roscher, National-Oekonomik des Ackerbaues, p. 26, Note 5. Stuttgart, 1888.
Ibid., p. 27.
Albert Niblack, The Coast Indians of Southern Alaska and Northern British Columbia, pp. 298-299, 304, 337-339. Washington, 1888.
Ratzel, History of Mankind, Vol. III, p. 173. London, 1896-1898.
Ibid., Vol. III. pp. 173-174.
Sven Hedin, Central Asia and Tibet, Vol. I, p. 184. New York and London, 1903.
John de Plano Carpini, Journey in 1246, p. 130. Hakluyt Society, London, 1904.
Journey of William de Rubruquis in 1253, p. 188. Hakluyt Society, London, 1903.
Volney, quoted in Malthus, Principles of Population, Chap. VII, p. 60. London, 1878.
Genesis, Chap. XIII, 1-12.