Grover, Nathan Clifford (1868-1956) Follansbee, Robert (1879-1952) Purton, Astley B. (1886-1962) Dickinson, W. E. United States of America. Geological Survey.
Grover, Nathan Clifford (1868-1956) Purton, Astley B. (1886-1962) McGlashan, Harry Deyoe (1879- ) Henshaw, Fred Forbes (1884-1933) Paulsen, Carl G. Follansbee, Robert (1879-1952) United States of America. Geological Survey.
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) United States of America. Geological Survey.