Groundwater quality and hydrogeology of Devonian-carbonate aquifers in Floyd and Mitchell counties, Iowa /
Robert D. Libra, George R. Hallberg, Gale G. Ressmeyer, Bernard E. Hoyer. Devonian stratigraphy of north-central Iowa : a geologic framework for the Devonian aquifer and karst systems in Floyd-Mitchell counties / by Brian J. Witzke and Bill J. Bunker.

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Limited (search only)   University of Illinois at Urbana-Champaign