Callaghan, Eugene (1904-1990) Buddington, Arthur Francis (1890-1980) United States of America. Geological Survey.
Moore, Bernard N. (1906- ) United States of America. Geological Survey.
Wells, Francis Gerritt (1898-1969) Waters, Aaron Clement (1905-1991) United States of America. Geological Survey.
Shenon, Philip John (1897-1966) Wells, Francis Gerritt (1898-1969) United States of America. Geological Survey.