Siegel, Donald I. <br/><br/>
Geochemistry of the Cambrian-Ordovician aquifer system in the Northern Midwest, United States / 
by D. I. Siegel. 
 - Washington:   United States Government Printing Office,   1989.  
 - vii, D76 p. :  maps ;  29 cm. 
 -  1405 Regional Aquifer-System Analysis : Northern Midwest Aquifer SystemChapter D .
<br/><br/>Includes bibliographical references (p. D56-D60). 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water--Composition--Middle West<br/>Geochemistry--Middle West<br/>Aquifers--Middle West<br/>Geology, Stratigraphic--Cambrian<br/>Geology, Stratigraphic--Ordovician<br/>Geology--Middle West
<br/><br/><label>Dewey Class. No.: </label>553.790977