Classification and mapping of agricultural land for national water-quality assessment /
Gilliom, Robert J.
Classification and mapping of agricultural land for national water-quality assessment / by Robert J. Gilliom and Gail P. Thelin. - Washington : Denver, Colo. : U.S. G.P.O. ; Free on application to the U.S. Geological Survey, Information Services, 1997. - vi, 70 p. : ill., col. maps ; 28 cm. - U.S. Geological Survey circular ; 1131 .
'National Water-Quality Assessment Program.'
Includes bibliographical references (p. 30).
Agricultural mapping--United States.
Land use, Rural--United States.
Water quality--United States.
Classification and mapping of agricultural land for national water-quality assessment / by Robert J. Gilliom and Gail P. Thelin. - Washington : Denver, Colo. : U.S. G.P.O. ; Free on application to the U.S. Geological Survey, Information Services, 1997. - vi, 70 p. : ill., col. maps ; 28 cm. - U.S. Geological Survey circular ; 1131 .
'National Water-Quality Assessment Program.'
Includes bibliographical references (p. 30).
Agricultural mapping--United States.
Land use, Rural--United States.
Water quality--United States.