Stebinger, Eugene (1883-1951) United States of America. Geological Survey.
Hares, Charles Joseph (1881-?) United States of America. Geological Survey.
Ashley, George Hall (1866-1951) United States of America. Geological Survey.
Butts, Charles (1863-1946) United States of America. Geological Survey.
Heald, Kenneth Conrad (1888-1971) United States of America. Geological Survey.
Robinson, Heath Montgomery United States of America. Geological Survey.
Stebinger, Eugene (1883-1951) United States of America. Geological Survey.
Fath, Arthur Earl (1887-1976) United States of America. Geological Survey.
Barnett, V. H. United States of America. Geological Survey.
Calvert, William R. United States of America. Geological Survey.
Hopkins, Oliver Baker United States of America. Geological Survey.