Grover, Nathan Clifford (1868-1956) Ellsworth, Clarence Eugene (1882- ) Follansbee, Robert (1879-1952) United States of America. Geological Survey.
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) Lamb, William Alfred (1881- ) Paulsen, Carl G. Follansbee, Robert (1879-1952) Spiegel, Jacob Birk Kinnison, Harvey Banks (1890- ) Beckman, Henry Claus (1888- ) United States of America. Geological Survey.
Grover, Nathan Clifford (1868-1956) Beckman, Henry Claus (1888- ) Follansbee, Robert (1879-1952) Kinnison, Harvey Banks (1890- ) Ellsworth, Clarence Eugene (1882- ) United States of America. Geological Survey.