Grover, Nathan Clifford (1868-1956) Harrington, Arthur William (1888-1964) Horton, Albert Howard (1875-1945) Lee, Lasley (1887- ) Grosbach, H. E. King, Warren Raymond Burchard, E. D. Stany Zjednoczone. Geological Survey
Grover, Nathan Clifford (1868-1956) Soulé, S. B. Grosbach, H. E. Lee, Lasley (1887- ) Harrington, Arthur William (1888-1964) Pierce, Charles Henry (1878- ) Kinnison, Harvey Banks (1890- ) Stany Zjednoczone. Geological Survey