The Experimental mine of the United States Bureau of Mines
Experimental mine
Information circular / Bureau of Mines ;
Information circular (United States. Bureau of Mines) ;
Rice, George S. (George Samuel), 1866-1950.
Greenwald, H. P. (Harold Putnam), b. 1893.
Howarth, H. C. (Henry C.), b. 1879.
G.S. Rice, H.P. Greenwald, and H.C. Howarth.