01174nam a2200325Ia 4500 108318 BIBL 20160527182515.0 900312s1991 dcu b f00010 eng 90003099 DLC DLC DLC n-usc-- EVLG GB1017 .Y68 1991 551.49/0977 20 I 19.16:1405-A 551.49 Y72s Young, H. L. 191426 Local Summary of ground-water hydrology of the Cambrian-Ordovician aquifer system in the northern Midwest, United States by H.L. Young. Washington U.S. G.P.O. 1992. p. cm. Regional aquifer-system analysis 157869 Local U.S. Geological Survey professional paper 1405-A 182296 Local Includes bibliographical references. Water, Under ground Middle West. 187457 Local Geography, Stratigraphic Ordovician. 227707 Local Geography, Stratigraphic Cambrian. 227707 Local Aquifers Middle West. 53771 Local U.S. Geological Survey professional paper ; 90112 90112 0 0 0 551_490000000000000_Y72S 0 evl 15067 10 10 1 2016-05-27 166409 0 551.49 Y72s 80000001077844 2016-05-27 00:00:00 r:108318 z:NCC:D 6