Report of the Geological exploration of the fortieth parallel
United States Geological Exploration of the Fortieth Parallel (1867-1881); King, Clarence, 1842-1901; Hague, A. (Arnold), 1840-1917; Emmons, Samuel Franklin, 1841-1911; Hague, James D. (James Duncan), 1836-1908; Meek, F. B. (Fielding Bradford), 1817-1876; Hall, James, 1811-1898; Whitfield, Robert Parr, 1828-1910; Ridgway, Robert, 1850-1929; Watson, Sereno, 1826-1892; Eaton, Daniel Cady, 1834-1895; Bien, Julius, 1826-1909