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  1. Report of the geological exploration of the fortieth parallel /
    By: United States Geological Exploration of the Fortieth Parallel - Bien, Julius, - Eaton, Daniel Cady, - Emmons, Samuel Franklin, - Hague, A. - Hague, James D. - Hall, James, - King, Clarence, - Meek, F. B. - Ridgway, Robert, - Watson, Sereno, - Whitfield, R. P.
    Publication info: Washington, D.C. :G.P.O.,1870-80
    Contributed by: University of Illinois Urbana Champaign
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