Hares, Charles Joseph (1881-?) 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.

Hopkins, Oliver B. 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.

Stebinger, Eugene (1883-1951) Stany Zjednoczone. Geological Survey

Ashley, George Hall (1866-1951) Stany Zjednoczone. Geological Survey

Butts, Charles (1863-1946) Stany Zjednoczone. Geological Survey