Grover, Nathan Clifford (1868-1956) Baldwin, George Clyde (1884-1951) Parker, Glenn Lane (1884-1946) Paulsen, Carl G. Purton, Astley B. (1886-1962) Henshaw, Fred Forbes (1884-1933) Stany Zjednoczone. Geological Survey
Grover, Nathan Clifford (1868-1956) Parker, Glenn Lane (1884-1946) Lamb, William Alfred (1881- ) Stany Zjednoczone. Geological Survey