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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. - Whitfield, R. P.
    Publication info: Washington, D.C. :G.P.O.,1870-80
    Contributed by: University of Illinois Urbana Champaign
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  2. 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, Robert Parr,
    Publication info: Washington :Govt. Print. Off.,1870-80
    Contributed by: Smithsonian Libraries
    BHL Collections: Smithsonian Libraries
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  3. Report of the Geological Exploration of the Fortieth Parallel, made by order of the Secretary of War according to acts of Congress of March 2, 1867, and March 3, 1869 /
    By: United States. - King, Clarence,
    Publication info: Washington :Government Printing Office,1870-1880.
    Contributed by: University of Michigan (archive.org)
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