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  1. 1
    Bedrock topography of east-central Iowa /
    by Hansen, Robert E
    Published 1972

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  2. 2
    Reports, with accompanying papers

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  3. 3
    The Yellow Spring Group of the Upper Devonian in Iowa /

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  4. 4
    Upper Devonian in Mason City and Garner areas /
    Published 1963

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  5. 5
    Southwestern Iowa field trip, Aug. 22-23, 1964
    Published 1964

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  6. 6
    Bedrock topography of southeast Iowa /
    by Hansen, Robert E
    Published 1973

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  7. 7
    Bedrock topography of west-central Iowa /
    by Hansen, Robert E
    Published 1986

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  8. 8
    Bedrock topography of central Iowa /
    by Hansen, Robert E
    Published 1985

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  9. 9
    Bedrock topography of southwest Iowa /
    by Sendlein, Lyle V. A
    Published 1980

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  10. 10
    Bedrock topography of northwest Iowa /
    by Hansen, Robert E
    Published 1986

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