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Lindgren, Waldemar, 1860-1939. (Geological Survey (United States), 1896)

Hayes, C. W. (Charles Willard), 1859-1916. (Geological Survey (United States), 1896)

Keith, Arthur. (Geological Survey (United States), 1897)

Keith, Arthur. (Geological Survey (United States), 1895)

Hayes, C. W. (Charles Willard), 1859-1916. (Geological Survey (United States), 1894)

Campbell, Marius R. (Marius Robinson), 1858-1940. (Geological Survey (United States), 1894)

Cross, Whitman, 1854-1949. (Geological Survey (United States), 1899)

Hill, Robert Thomas, 1858-1941. (Geological Survey (United States), 1897)

Emerson, Benjamin Kendall, b. 1843. (Geological Survey (United States), 1898)

Hague, Arnold, 1840-1917. (Geological Survey (United States), 1896)