Carl Rampacek / Edward G. King / H. N. Smith / Hans G. Wolfhard / John J. Mulligan / John William Chester / Oliver Q. Leone / Phillip G. Pigott / R. B. Fisher / S. R. B. Cooke / T. E. Gray / Thomas C. Atchison / United States. Bureau of Mines / Victor Kalcevic / William A. Stickney / Willis Beckering / William Joseph Campbell / A. U. Christensen / Arthur E. Bruszak / Eugene Robert Palowitch / Harry C. Fuller / J. D. Lankford / J. R. Nettle / J. W. Smith / John W. Thatcher / Kenneth Keith Kelley / Melvin Leon / Miles E. Tyrrell / Waldemar M. Dressel / Walter W. Fowkes / William Alan McKinney / William E. Tournay / D. H. Baker / Julius Bruce Clemmer / P. T. Waddleton / W. C. Kommes | 