[1119] Sven Hedin, Central Asia and Tibet, Vol.  I, pp. 96, 136, 359, New York and London, 1903.  Ellsworth Huntington, The Pulse of Asia, pp. 193, 202, 212, 213.  Boston, 1907.

[1120] Sir Francis Younghusband, The Heart of a Continent, pp. 103, 104, 107, 112-116, 120, 125-128, 137, 138, 143.  London, 1904.

[1121] S.W.  Zwemer, Arabia the Cradle of Islam, pp. 147, 151.  New York, 1900.  D.G.  Hogarth, The Nearer East, pp. 185, 195. 265.  London, 1902.

[1122] Nachtigal, Sahara und Sudan, Vol.  I, pp. 214-218, 267-269.  Berlin, 1879.

[1123] Ratzel, History of Mankind, Vol.  III, p. 168.  London, 1896-1898.

[1124] H.R.  Mill, International Geography, pp. 906, 914.  New York, 1902.

[1125] H. Barth, Travels in North and Central Africa, Vol.  I, pp. 152, 207, 210, 211.  New York, 1857.

[1126] Ibid., 41-44, 52, 61-64, 67, 76, 93, 95, 99, 103, 105.

[1127] L. March Phillipps, In the Desert, p. 174.  London, 1905.

[1128] Sir Thomas Holdich, India, pp. 91-93.  London, 1905.

[1129] M.A.  Stein, The Sand-Buried Ruins of Khotan, pp. 275-324, 354-408.  London, 1903.

[1130] H. Barth, Travels in North and Central Africa, Vol.  I, chap.  III.  New York, 1857.

[1131] Ellsworth Huntington, The Pulse of Asia, pp. 160-190, 209, 304, 309-310, 315, 367.  Boston, 1907.

[1132] J.L.  Burckhardt, Notes on the Bedouins and Wahabys, Vol.  I, pp. 57-64, 238-242.  London, 1831.

[1133] E. Huntington, The Pulse of Asia, pp. 137-138.  Boston, 1907.

[1134] John de Plano Carpini, Journey to the Northeast, pp. 109-111, 120.  Hakluyt Society, London, 1904.  Journey of William de Rubruquis, pp. 191-193, 203, 224.  Hakluyt Society, London, 1903.

[1135] W.W.  Rockhill, The Land of the Lamas, p. 80.  New York, 1891.

[1136] Vambery, Reise in Mittel Asien, p. 295.  Leipzig, 1873.

[1137] Nachtigal, Sahara und Sudan, Vol.  I, pp. 257, 268.  Berlin, 1879.

[1138] E. Huntington, The Pulse of Asia, p. 74.  Boston, 1907.

[1139] L. March Phillipps, In the Desert, pp. 198-201.  London, 1905.

[1140] D. Livingstone, Travels and Researches in South Africa, p. 55.  New York, 1859.

[1141] W. Roscher, Grundlagen der Nationaloekonomik, Book VI, chap.  II, p. 244.  Stuttgart, 1886.

[1142] Ratzel, History of Mankind, Vol.  III, p. 170.  London, 1896-98.

[1143] W.W.  Rockhill, Land of the Lamas, p. 80.  New York, 1891.

[1144] J.L.  Burckhardt, Notes on the Bedouins and Wahabys, Vol.  I, pp. 106, 187.  London, 1831.  S.M.  Zwemer, Arabia the Cradle of Islam, pp. 162, 268.  New York, 1900.

[1145] Westermarck, History of Human Marriage, p. 429, notes 2 and 5, p. 440, note 2, p. 507.  London, 1891.

[1146] J.L.  Burckhardt, Notes on the Bedouins and Wahabys, Vol.  I, pp. 47, 48, 70, 71, 191-192, 239.  London, 1831.