by Henry Stooks Smith

1845

by Henry Schroeder

1852

by William Iler Crane, William Henry Wheeler

1919

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