Bass, N. Wood (1893-1979) Kennedy L. E. Dillard, W. Reese Leatherock, Otto Hengst, Jess 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.
Winchester, Dean Eddy (1883-1936) Hares, Charles Joseph (1881-?) Lloyd Russell E. Parks, E. M. United States of America. Geological Survey.
Capps, Stephen R. (1881-1949) United States of America. Geological Survey.
Shaw, Eugene Wesley (1881-1935) Matson, George Charlton (1873-?) Wegemann, Carroll Harvey (1879-?) United States of America. Geological Survey.
Marshall, Robert Bradford (1867-1949) United States of America. Geological Survey.
Eakin, Henry Miner (1883-1936) United States of America. Geological Survey.
Mertie, J. B. Jr. (1888-1980) United States of America. Geological Survey.
Ross, Clyde P. (1891-1965) United States of America. Geological Survey.
Smith, Philip S. (1877-1949) United States of America. Geological Survey.
Hawkes, H. E. (1912-1996) Hotz, Preston Enslow (1913- ) United States of America. Geological Survey.
Schrader, Frank Charles (1860-1944) Stone, Ralph Walter (1876-1964) Sanford, Samuel (1865-1927) United States of America. Geological Survey.
Eckel, Edwin Butt (1906-1989) Yates, Robert G. (1910- ) Granger, A. E. (1911- ) United States of America. Geological Survey.
Brooks, Alfred Hulse (1871-1924) United States of America. Geological Survey.
Ross, Clyde P. (1891-1965) United States of America. Geological Survey.
Marshall, Robert Bradford (1867-1949) United States of America. Geological Survey.
Marshall, Robert Bradford (1867-1949) United States of America. Geological Survey.
Marshall, Robert Bradford (1867-1949) United States of America. Geological Survey.
Gale, Hoyt Stoddard (1876-1952) United States of America. Geological Survey.
Callaghan, Eugene (1904-1990) United States of America. Geological Survey.
Brooks, Alfred Hulse (1871-1924) United States of America. Geological Survey.
Hess, Frank Lee (1871-1955) United States of America. Geological Survey.