Albert John Kraemer / B. Marvel O'Harra / Charles Wesley Davis / George William Jones / Louis Downer Tracy / Osborn Monnett / Sidney Hershberg Katz / United States. Bureau of Mines / William Albert Dunkley / William Melvin Weigel / William Waugh Adams / John Jacob Bloomfield / L. Russell Hughes / Lawrence Bursley Berger / William Floyd Holbrook |