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[10] Bastin, Edson S., and McCaskey, H. D., The work on mineral resources done by the U. S. Geological Survey: Min. Res. of the United States for 1918, U. S. Geol. Survey, pt. 1, 1920, p. 3a.

[11] Spurr, J. E., Who owns the earth?: Eng. and Min. Jour., vol. 109, 1920, pp. 389–390.