Classification and mapping of agricultural land for national water-quality assessment
By: by Robert J. Gilliom and Gail P. Thelin.
Contributors: Thelin, Gail P.; National Water-Quality Assessment Program (U.S.)
Series: U.S. Geological Survey circular ;; 1131
Publisher: U.S. G.P.O.; Free on application to the U.S. Geological Survey, Information Services
Published: 1997
Place of publication: Washington; Denver, Colo
Language: eng
Number of pages: 70
Subjects: Agricultural mapping -- United States.; Land use mapping -- United States.; Land use, Rural -- United States.; Water quality -- United States.
Notes: Includes bibliographical references (p. 30).
"National Water-Quality Assessment Program."