Classification and mapping of agricultural land for national water-quality assessment /
Gilliom, Robert J.
Thelin, Gail P.
National Water Quality Assessment Program (U.S.)
Geological Survey (U.S.)
[Washington, D.C.?] : U.S. G.P.O. ; Denver, Colo. : Free on application to the U.S. Geological Survey, Information Services,
1997.
"National Water-Quality Assessment Program."
"U.S. Department of the Interior, U.S. Geological Survey"--T.p. verso.
Shipping list no.: 97-0282-P.
Includes bibliographical references (p. 30).
Agricultural mapping
Land use, Rural
Water quality