Investigations of Permissible Electric Mine Lamps
United States. Bureau of Mines, McHenry Mosier, William Henry Roadstrum, William Waugh Adams, M. E. Kolhos, Eugene Delos Gardner, Alva Britt Hooker, Virginia E. Wrenn, Charles George Maier, L. C. Ilsley, William Carroll Schroeder, Abraham Albert Berk, J. R. Thoenen, L. E. Geyer, M. G. Parry, S. L. Windes