Grover, Nathan Clifford (1868-1956) Horton, Albert Howard (1875-1945) Burchard, E. D. King, Warren Raymond Stany Zjednoczone. Geological Survey
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