Mansfield, George Rogers (1875-1947) United States of America. Geological Survey.
Burchard, Ernest Francis (1875-1961) United States of America. Geological Survey.
Knopf, Adolph (1882-1966) United States of America. Geological Survey.
Butler, Bert Sylvenus (1877-1960) Loughlin, Gerald Francis (1880-1946) United States of America. Geological Survey.
Butler, Bert Sylvenus (1877-1960) United States of America. Geological Survey.
Loughlin, Gerald Francis (1880-1946) United States of America. Geological Survey.
Hill, M. J. United States of America. Geological Survey.
Jones, Edward L. United States of America. Geological Survey.
Bastin, Edson Sunderland (1878-1953) Hill, James Madison (1884-?) United States of America. Geological Survey.
Ransome, Frederick Leslie (1868-1935) Gale, Hoyt Stoddard (1876-1952) United States of America. Geological Survey.
Burchard, Ernest Francis (1875-1961) United States of America. Geological Survey.
Ransome, Frederick Leslie (1868-1935) United States of America. Geological Survey.
Knopf, Adolph (1882-1966) United States of America. Geological Survey.
Jones, Edward L. United States of America. Geological Survey.
Mansfield, George Rogers (1875-1947) United States of America. Geological Survey.
Lee, Willis Thomas (1864-1926) United States of America. Geological Survey.
Schaller, Waldemar Theodore (1882-1967) United States of America. Geological Survey.