Matson, George Charlton (1873-?) United States of America. Geological Survey.
Howell, Ralph W. Wegemann, Carroll Harvey (1879-?) United States of America. Geological Survey.
Lesher, Carl Eugene (1885-?) United States of America. Geological Survey.
Wegemann, Carroll Harvey (1879-?) Heald, Kenneth Conrad (1888-1971) United States of America. Geological Survey.
Wegemann, Carroll Harvey (1879-?) United States of America. Geological Survey.
Wegemann, Carroll Harvey (1879-?) United States of America. Geological Survey.
Lupton, Charles Thomas (1878-1935) United States of America. Geological Survey.
Stebinger, Eugene (1883-1951) United States of America. Geological Survey.
English, Walter A. United States of America. Geological Survey.
Condit, Daniel Dale (1886-?) United States of America. Geological Survey.
Condit, Daniel Dale (1886-?) 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.
Wegemann, Carroll Harvey (1879-?) United States of America. Geological Survey.
Smith, George Otis (1871-1944) United States of America. Geological Survey.
Hess, Frank Lee (1871-1955) United States of America. Geological Survey.
Anderson, Robert Pack, Robert W. (1885-?) United States of America. Geological Survey.
Capps, Stephen Reid (1881-1949) Johnson, Bertrand Leroy (1882-?) United States of America. Geological Survey.
Matson, George Charlton (1873-?) United States of America. Geological Survey.
Capps, Stephen Reid (1881-1949) United States of America. Geological Survey.
Brooks, Alfred Hulse (1871-1924) United States of America. Geological Survey.
Emmons, William Harvey (1876-1948) 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.
Spencer, Arthur Coe (1871-1964) United States of America. Geological Survey.