Briel, L. I. <br/><br/>
Water quality in the Appalachian Valley and Ridge, the Blue Ridge, and the Piedmont physiographic provinces, eastern United States / 
by L.I. Briel. 
 - Washington, DC :  U.S. Geological Survey,  1997. 
 - 1 v. (various pagings) :  ill. ;  28 cm. 
 - Regional aquifer-system analysis--Appalachian Valley and Piedmont ;  D U.S. Geological Survey professional paper ;  1422 .
<br/><br/>Includes bibliographical references. 
<br/><br/><label>LCCN: </label>97-007723 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water quality--Appalachian Region.