by Everett Perry Carman, Hiram Brown Humphrey, Robert L. Beatty, Seth T. Reese, Simon Harry Ash, Theron Albert Klinefelter, United States. Bureau of Mines, E. G. Graf, Hazel J. Stratton, Henry A. Dierks, Howard Phillips Hamlin, Naomi W. Kearney, Virginia E. Wrenn, Elizabeth J. Reid, P. S. Miller, Richard Clarke Corey

1955