C. E. Hennig / Donald E. Redmon / Floyd Davis Everett / Ivan F. Avery / James S. Browning / Joseph A. Sutton / Mary S. Esfandiary / Max J. Spendlove / Michael George Zabetakis / Raymond Gordon Travis / Ronald W. Schaefer / Ruth Frank Brinkley / United States. Bureau of Mines / Wilbert Leland Dare / H. H. Engel / John D. Corrick / P. M. Lindstrom / Robert W. Van Dolah / William H. Harrison / Frank J. Myslinski |