A. G. Loomis / Claude W. Sill / Donald W. Frommer / Eugene O. Binyon / Franklin A. Rutledge / G. L. Humphrey / George William Jones / Heine Kenworthy / K. C. Vincent / Louis Anthony Panek / Michael George Zabetakis / Oscar Carl Blade / Robert W. Smith / United States. Bureau of Mines / A. N. Fried / D. T. Holmes / Douglas H. Platt / Harry C. Fuller / Heber E. Peterson / Helen E. Edwards / J. S. Absalom / John J. Mulligan / M. M. Fine / D. C. Crowell / D. H. Baker / Lawrence Bursley Berger / Stuart Robert Brinkley / Frank S. Wartman | 