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- ) United States of America. Geological Survey.
Grover, Nathan Clifford (1868-1956) Lamb, William Alfred (1881- ) Soulé, S. B. Spiegel, Jacob Birk Grosbach, H. E. Beckman, Henry Claus (1888- ) United States of America. Geological Survey.