A. W. Belden / Clarence A. Wright / George Arthur Burrell / Harold Hayward Clark / Horace Chamberlain Porter / Irving Cowan Allen / John Kay Clement / Louis Grow Huntley / Ozni Porter Hood / Ralph Arnold / Raymond Silliman Blatchley / Samuel B. Flagg / United States. Bureau of Mines / A. G. Heggem / Albert Scott Crossfield / Arno Carl Fieldner / Frank Meyers Seibert / George C. Cook / Valentín R. Garfias / Forrest E. Woodman | 