Gilluly, James (1896-1980) Reed, John Calvin (1905-1993) Park, Charles F. (1903-1990) United States of America. Geological Survey.
Ross, Clyde Polhemus (1891-1965) United States of America. Geological Survey.
Butler, Bert Sylvenus (1877-1960) Vanderwilt, John W. (1898-1992) Henderson, Charles W. (1885-?) United States of America. Geological Survey.
Shenon, Philip John (1897-1966) United States of America. Geological Survey.