Harden, Stephen L. <br/><br/>
Ionic composition and nitrate in drainage water from fields fertilized with different nitrogen sources, Middle Swamp watershed, North Carolina, August 2000-August 2001  [microform] 
by Stephen L. Harden and Timothy B. Spruill ; prepared in cooperation with the North Carolina Department of Environment and Natural Resources, Division of Water Quality, Groundwater Section. 
 - [Reston, Vir.]  U.S. Geological Survey  2004. 
 - iv, 14 p.  ill. (some col.), col. maps  28 cm. 
 - Scientific investigations report  2004-5123. .
<br/><br/> Shipping list no.: 2004-511-M. 
<br/><br/>Includes bibliographical references (p. 12-14). 
<br/><br/><br/>Microfiche. <br/>[Washington, D.C.] <br/>Supt. Docs./G.P.O. <br/>2004. <br/>1 microfiche : negative. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Nitrates--Environmental aspects--North Carolina--Middle Swamp Watershed (Pitt County)<br/>Water--Pollution--North Carolina--Middle Swamp Watershed (Pitt County)<br/>Drainage--Environmental aspects--North Carolina--Middle Swamp Watershed (Pitt County)
<br/><br/><label>GPO Item No.: </label>0624-B-02 (MF) 
<br/><br/><label>Gov. Doc. Class. No.: </label>I 19.42/4-4:2004-5123