Dorr, John Van N. <br/><br/>
Physiographic, stratigraphic and structural development of the qudrilatero ferrifero minas gerais, Brazil / 
by John Van N. Dorr 
 - Washington :  United States Government Printing Office,  1969 
 - Various pagings :  ill. ;  22 cm. 
 - U.S. Geological Survey professional paper;  641-A .
<br/><br/>Includes bibliography 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Groundwater--United States<br/>Economic Geology--United States
<br/><br/><label>Dewey Class. No.: </label>558.151