Publication Information

Guidebook Series
1992-05-01 
GB-15 
Environmental geology of the Big Spring groundwater basin, northeast Iowa, R. D. Libra, G. R. Hallberg, R. D. Rowden, E. A. Bettis III, S. J. Kalkcoff, and D. G. Baker, 1992, 51 p., 26 figs., 4 tables. 
Clayton County Ordovician Guidebooks guidebook guidebooks field trip guide 
Clayton 
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