Young, H. L. <br/><br/>
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 U.S. Geological Survey professional paper  1405-A .
 - U.S. Geological Survey professional paper ; .
<br/><br/>Includes bibliographical references. 
<br/><br/><label>LCCN: </label>90003099  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water, Under ground--Middle West.<br/>Geography, Stratigraphic--Ordovician.<br/>Geography, Stratigraphic--Cambrian.<br/>Aquifers--Middle West.
<br/><br/><label>LC Class. No.: </label>GB1017  / .Y68 1991 
<br/><br/><label>Dewey Class. No.: </label>551.49/0977 
<br/><br/><label>Gov. Doc. Class. No.: </label>I 19.16:1405-A