Cravotta, Charles A. <br/><br/>
Use of stable isotopes of carbon, nitrogen, and sulfur to identify sources of nitrogen in surface waters in the lower Susquehanna River Basin, Pennsylvania / 
by Charles A. Cravotta, III. 
 - [Reston, Va.] :  Denver CO :  U.S. Dept. of the Interior, U.S. Geological Survey ;  U.S. Geological Survey, Branch of Information Services,  1997 [i.e., 2002]. 
 - v, 99 p. :  ill., map ;  28 cm. 
 - U.S. Geological Survey water-supply paper ;  2497 .
<br/><br/> 'Prepared in cooperation with the Pennsylvania Department of Environmental Protection, Bureau of Soil and Water Conservation.'  Shipping list no.: 2002-0121-P. 
<br/><br/>Includes bibliographical references (p. 63-68). 
<br/><br/><label>ISBN: </label>0607872071 
<br/><br/><label>Source: </label>9-790607-872070  USGS 
<br/><br/><label>LCCN: </label>97-010381 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Nitrogen--Environmental aspects--Susquehanna River Watershed.<br/>Water--Pollution--Point source identification.--Susquehanna River Watershed<br/>Radioactive tracers in water pollution research--Susquehanna River Watershed.
<br/><br/><label>LC Class. No.: </label>TD427.N5  / C73 1997 
<br/><br/><label>Dewey Class. No.: </label>628.1/61 
<br/><br/><label>GPO Item No.: </label>0625 
<br/><br/><label>Gov. Doc. Class. No.: </label>I 19.13:2497