[268] F. Ratzel: Politische Geographie, 2nd ed., Munich, 1903. Cf. Chap. 16, “Der Verkehr als Raumbewältiger,” pp. 447-534.
[269] R. Blanchard: La Flandre, Paris, 1906.
[270] Bull. Com. Trav. Hist. et Scien., Sec. Géogr., Vol. 29, 1914, p. xli.
[271] J. Vidal de la Blache: Étude sur la Vallée Lorraine de la Meuse, Paris, 1908, pp. 165-180.
[272] Cf. inset on pp. 63-64, Andree’s Handatlas, 6th ed., 1915.
[273] J. Brunhes: La Géographie humaine, Paris, 1912, pp. 598-599.
[274] L. W. Lyde: The Continent of Europe, London, 1913, p. 383.
[275] D. W. Freshfield: The Southern Frontiers of Austria, Geogr. Journ., Vol. 46, 1915, pp. 414-436.
[276] R. von Pfaundler: Österreichisch-italienische Grenzfragen, Pet. Mitt., Vol. 61, 1915, pp. 217-223.
[277] B. C. Wallis: Distribution of Nationalities in Hungary, Geogr. Journ., Vol. 52, 1916, No. 3, pp. 177-189.