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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. (Arnold), - Hague, James D. (James Duncan), - Hall, James, - King, Clarence, - Meek, F. B. (Fielding Bradford), - Ridgway, Robert, - Watson, Sereno, - Whitfield, R. P.
    Publication info: Washington, D.C. :G.P.O.,1870-80
    Holding Institution: University Library, University of Illinois Urbana Champaign
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  2. Visitors' guide to the geological and palaeontological collections in the American Museum of Natural History, Seventy-seventh Street and Eighth Avenue, New York City /
    By: American Museum of Natural History. - Whitfield, R. P.
    Edition: Members' ed.
    Publication info: New York :Printed for the Museum,1892.
    Holding Institution: American Museum of Natural History Library
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