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Block Diagram of Geology: Nebraska Maps maps university-of-nebraska-lincoln

1989. A diagram of geology of the state of Nebraska. LPS Natural Resource District.


Geological Map of Ohio Maps maps university-of-michigan

1872. Walling, Henry Francis, 1825-1888., Gray, O. W. (Ormando Wyllis), 1829-1912., Stedman, Brown & Lyon., David Rumsey Collection., and Cartography Associates. 1 map : hand col. ; 36 x 26 cm. Includes "Section through northern Ohio," "Section from Cincinnati to Marietta," and explanation of colors.