by George J. Young.
|Main Author:||Young, George Joseph, 1876-|
Reno, Nev. : University of Nevada, .
"A paper presented to the American institute of mining engineers at the San Francisco meeting, October, 1911, and, by permission of the Council, reprinted from the Bulletin of the American institute of mining engineers, no. 59, November, 1911".
34 p. :
ill., diagrs. ;
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