Lee, Willis Thomas (1864-1926) Stone, Ralph Walter (1876-1964) Gale, Hoyt Stoddard (1876-1952) United States of America. Geological Survey.
Lupton, Charles Thomas (1878-1935) Condit, Daniel Dale (1886-?) United States of America. Geological Survey.
Hewett, Donnell Foster (1881-?) Callaghan, Eugene (1904-1990) Moore, B. N. Nolan, Thomas Brennan (1901-1992) Rubey, William Walden (1898-1974) Schaller, Waldemar Theodore (1882-1967) United States of America. Geological Survey.