The SciencesJanuary 8, 1916
Electric Activity in Ore Deposits—II
Complicated Conditions and Some of the Results Concluded from Scientific American Supplement No. 2087, Page 16, January 1, 1916
Stories by Roger C. Wells
The SciencesJanuary 1, 1916
Electric Activity in Ore Deposits—I
Complicated Conditions and Some of the Results