The Economic Aspect of Geology

by C. K. Leith

FOOTNOTES:

[37] Smith, George Otis, and others, The classification of the public lands: Bull. 537, U.S. Geol. Survey, 1913.

[38] Schlumberger, C., Study of underground electrical prospecting: Translated from the French by Sherwin F. Kelly, Paris, 1920.

Bergstrom, Gunnar, and Bergholm, Carl, "Teknisk Tidskrift, Kemi och Bergvetenskap," 1918, Book 12.

[39] Hoover, Herbert C., Principles of mining: McGraw-Hill Book Co., New York, 1909, p. 32.

[40] Leith, C. K., Use of geology in iron ore exploration: Econ. Geol., vol. 7, 1912, pp. 662-675.

[41] Van Hise, C. R., and Leith, C. K., Geology of the Lake Superior region: Mon. 52, U.S. Geol. Survey, 1911.

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