01040nam a2200289Ia 4500001000700000003000500007005001700012008004100029010001500070040001800085043001200103050002200115082002000137086001900157100002400176245013500200260003500335300001100370490004400381490006100425504004100486650004500527650004900572650004700621650003400668830004800702108318BIBL20160527182515.0900312s1991    dcu      b   f00010 eng    a 90003099   aDLCcDLCdDLC  an-usc--00aGB1017b.Y68 199100a551.49/09772200 aI 19.16:1405-A10aYoung, H. L.2Local10aSummary of ground-water hydrology of the Cambrian-Ordovician aquifer system in the northern Midwest, United Statescby H.L. Young.0 aWashingtonbU.S. G.P.O.c1992.  ap. cm. 0aRegional aquifer-system analysis2Local1 aU.S. Geological Survey professional paperv1405-A2Local  aIncludes bibliographical references. 0aWater, Under groundzMiddle West.2Local 0aGeography, StratigraphicyOrdovician.2Local 0aGeography, StratigraphicyCambrian.2Local 0aAquiferszMiddle West.2Local 0aU.S. Geological Survey professional paper ;