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. 
 - D115p; illust. 30cm 
 - U.S. Geological Survey professional paper ; 1422-D .
<br/><br/><br/>eng 
<br/><br/><label>ISBN: </label>0607868422 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water quality--Appalachian Region.