Winchester, Dean Eddy (1883-1936) United States of America. Geological Survey.

Schaller, Waldemar Theodore (1882-1967) United States of America. Geological Survey.

Moffit, Fred Howard (1874-1958?) United States of America. Geological Survey.

Gale, Hoyt Stoddard (1876-1952) United States of America. Geological Survey.

Butler, Bert Sylvenus (1877-1960) Gale, Hoyt Stoddard (1876-1952) United States of America. Geological Survey.

Marshall, Robert Bradford (1867-1949) United States of America. Geological Survey.

Campbell, Marius Robinson (1858-1940) United States of America. Geological Survey.

Clarke, Frank Wigglesworth (1847-1931) United States of America. Geological Survey.

Lee, Willis Thomas (1864-1926) Stone, Ralph Walter (1876-1964) Gale, Hoyt Stoddard (1876-1952) United States of America. Geological Survey.

Diller, Joseph Silas (1850-1928) United States of America. Geological Survey.

Darton, Nelson Horatio (1865-1948) United States of America. Geological Survey.

Ashley, George Hall (1866-1951) United States of America. Geological Survey.

Siebenthal, Claude Ellsworth (1869-1930) United States of America. Geological Survey.

Munn, Malcolm John (1874-1949) United States of America. Geological Survey.

Nickles, John Milton (1859-1945) United States of America. Geological Survey.

Evans, Isabel P. United States of America. Geological Survey.

Munn, Malcolm John (1874-1949) United States of America. Geological Survey.

Lupton, Charles Thomas (1878-1935) United States of America. Geological Survey.

Day, David Talbot (1859-1925) United States of America. Geological Survey.

Pack, Robert Wallace (1885-?) English, Walter A. United States of America. Geological Survey.

Barnett, V. H. United States of America. Geological Survey.

Spencer, Arthur Coe (1871-1964) United States of America. Geological Survey.

Emmons, William Harvey (1876-1948) United States of America. Geological Survey.

Lupton, Charles Thomas (1878-1935) United States of America. Geological Survey.