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por Udvardy, Miklos D. F., 1919-1998-
Publicado 1994 -
por Austin, Oliver Luther, 1903-
Publicado 1961 -
por True, Dan, 1924-
Publicado 1993 -
Report of the Geological exploration of the fortieth parallel made by order of the Secretary of War according to the acts of Congress of March 2 1867 and March 3 1869under the direction of A A Humphreys chief of engineersConference Proceeding BookPublicado 1870
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por Dunning, Joan, 1948-
Publicado 1994 -
por Cortright, Sandy
Publicado 1996