Schultz, Robert S., Jr., Bull. Am. Inst. Mining and Metallurgical Engrs. In preparation.

Control is here used in a very general sense to cover activities ranging from regulation to management and ownership. The context will indicate in most cases that the word is used in the sense of regulation when referring to governmental relationships.

For more detailed description of this subject the reader is referred to The use of geology on the Western Front, by Alfred H. Brooks, Prof. Paper 128-D, U. S. Geol. Survey, 1920.