Mansfield, George Rogers (1875-1947) Heroy, W. B. Stany Zjednoczone. Geological Survey
Jones, Edward L. Jr. Stany Zjednoczone. Geological Survey
Mansfield, George Rogers (1875-1947) Stany Zjednoczone. Geological Survey
Mansfield, George Rogers (1875-1947) Stany Zjednoczone. Geological Survey
Umpleby, Joseph Bertram (1883-1967) Westgate, Lewis Gardner (1868-1948) Ross, Clyde Polhemus (1891-1965) Hewett, Donnell Foster (1881-?) Stany Zjednoczone. Geological Survey
Ross, Clyde Polhemus (1891-1965) Stany Zjednoczone. Geological Survey
Jones, Edward L. Stany Zjednoczone. Geological Survey
Schrader, Frank Charles (1860-1944) Stany Zjednoczone. Geological Survey
Behre, Charles H. (1896- ) Stany Zjednoczone. Geological Survey
Umpleby, Joseph Bertram (1883-1967) Jones, Edward L. Jr. Stany Zjednoczone. Geological Survey
Schrader, Frank Charles (1860-1944) Ross, Clyde Polhemus (1891-1965) Stany Zjednoczone. Geological Survey
Hewett, Donnell Foster (1881-?) Stany Zjednoczone. Geological Survey
Schultz, Alfred Reginald (1876-?) Stany Zjednoczone. Geological Survey
Ross, Clyde P. (1891-1965) United States of America. Geological Survey.
Ross, Clyde Polhemus (1891-1965) United States of America. Geological Survey.
Mansfield, George Rogers (1875-1947) United States of America. Geological Survey.
Hill, M. J. United States of America. Geological Survey.
Ross, Clyde Polhemus (1891-1965) United States of America. Geological Survey.
Ross, Clyde Polhemus (1891-1965) United States of America. Geological Survey.