Young, H. L. <br/><br/>
Hydrogeology of the Cambrian-Ordovician aquifer system in the northern midwest, United States 
by H.L. Young ; with a section on ground-water quality by D.I. Siegel. 
 - Washington  U.S. G.P.O.  1992. 
 - vii, 99 p. 
 - U.S. Geological Survey professional paper  1405-B Regional aquifer-system analysis--northern midwest Regional aquifer-system analysis--northern midwest aquifer system .
<br/><br/>Includes bibliographical references. 
<br/><br/><label>LCCN: </label>91030254  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water, Under ground--Middle West.<br/>Geology, Stratigraphic--Ordovician.<br/>Geology, Stratigraphic--Cambrian.<br/>Aquifers--Middle West.
<br/><br/><label>LC Class. No.: </label>GB1017  / .Y67 1992 
<br/><br/><label>Dewey Class. No.: </label>551.49/0977 
<br/><br/><label>Gov. Doc. Class. No.: </label>I 19.16:1405-B