Dane, Carle Hamilton (1900-1968) Rothrock, Howard E. (1893-1983) Williams, James Steele (1896-1957) United States of America. Geological Survey.
Hendricks, Thomas A. (1907-1985) United States of America. Geological Survey.
Knechtel, Maxwell M. (1897-1984) United States of America. Geological Survey.