Lietman, Patricia L. <br/><br/>
Evaluation of agricultural best-management practices in the Conestoga River Headwaters, Pennsylvania : a summary report, 1982-90 by Patricia L. Lietman 

 - [Washington, D.C.] : U.S. G.P.O. ; Denver, CO : For sale by the U.S. Geological Survey, Branch of Information Services,  1997 
 - 69p; illust. 30cm 
 - U.S. Geological Survey water-supply paper ; 2493 .
<br/><br/><br/>eng 
<br/><br/><label>ISBN: </label>0607868120 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agricultural chemicals--Environmental aspects--Pennsylvania--Conestoga River Watershed.<br/>Rocks, Carbonate--Pennsylvania--Conestoga River Watershed.<br/>Water quality management--Pennsylvania--Conestoga River Watershed.<br/>Water quality--Pennsylvania--Conestoga River Watershed.