Classification and mapping of agricultural land for national water-quality assessment

Main Author: Gilliom, Robert J.
Other Authors: Thelin, Gail P., National Water-Quality Assessment Program (U.S.), Geological Survey (U.S.)
Format: Book
Language: English
Published: Washington : U.S. G.P.O., 1997.
Physical Description: vi, 70 pages : illustrations, color maps ; 28 cm.
Series: U.S. Geological Survey circular ; 1131.
Subjects:

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