A. T. Harris / Charles E. Whieldon / Gary A. Kingston / John C. Hartley / Kenneth H. Johnston / Melvin P. Silverman / Norman E. Hanna / Richard D. Miller / Robert E. Barieau / United States. Bureau of Mines / Wallace W. Key / Warren E. Morrison / C. D. McMaster / C. I. Pierce / Geraldine P. Norrell / P. A. Richardson / W. T. Millar |