Charles Arthur Herbert / Elmer Allen Holbrook / Henry Kreisinger / Ned H. Snyder / Oliver Caldwell Ralston / Ronald Van Auken Mills / Roy R. Hornor / Theodore Earl Swigart / United States. Bureau of Mines / Walter Richard Crane / Charles Edward Beecher / Harry Earle Tufft / John Blizard / John Joseph RRutledge / Robert Dickson Pike / Thomas Fraser / Charles Edward Augustine / Lionel Herman Duschak / Bertram J. Cross |