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  1. 1
    The Yellow Spring Group of the Upper Devonian in Iowa /

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  2. 2
    Upper Devonian in Mason City and Garner areas /
    Published 1963

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  3. 3
    Southwestern Iowa field trip, Aug. 22-23, 1964
    Published 1964

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  4. 4
    Lancaster-Mineral Point folio, Wisconsin-Iowa-Illinois /

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  5. 5
    Elk Point folio, South Dakota-Nebraska-Iowa
    by Todd, James Edward, 1846-1922
    Published 1908

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  6. 6
    Geology of Boone County

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  7. 7
    Geology of Warren County
    by Tilton, John Littlefield, 1863
    Published 1896

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  8. 8
    Geology of Mahaska county
    by Bain, Harry Foster, 1872-1948
    Published 1895

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  9. 9
    Geology of Plymouth County
    by Bain, Harry Foster, 1872-1948
    Published 1898

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  10. 10
    Geology of Henry County
    by Savage, Thomas Edmund, 1866-
    Published 1902

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