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Darton, Nelson Horatio, 1865-1948. (Geological Survey (United States), 1920)

Darton, Nelson Horatio, 1865-1948. (Geological Survey (United States), 1904)

Darton, Nelson Horatio, 1865-1948. (Geological Survey (United States), 1896)

Darton, Nelson Horatio, 1865-1948. (Geological Survey (United States), 1901)

Darton, Nelson Horatio, 1865-1948.; Smith, W. S. Tangier (William Sidney Tangier), 1869-1962. (Geological Survey (United States), 1904)

Darton, Nelson Horatio, 1865-1948. (Geological Survey (United States), 1903)

Darton, Nelson Horatio, 1865-1948. (Geological Survey (United States), 1908)

Darton, Nelson Horatio, 1865-1948.; Salisbury, Rollin D., 1858-1922. (Geological Survey (United States), 1906)

Darton, Nelson Horatio, 1865-1948. (Geological Survey (United States), 1894)

Darton, Nelson Horatio, 1865-1948. (Geological Survey (United States), 1899)