Classification and mapping of agricultural land for national water-quality assessment
by Robert J. Gilliom and Gail P. Thelin
Bok Engelsk 1997 Robert J Gilliom
| Utgitt | Washington : Denver, Colo. : U.S. G.P.O. ; Free on application to the U.S. Geological Survey, Information Services , 1997
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| Omfang | vi, 70 s. : ill.
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| Opplysninger | "National Water-Quality Assessment Program."
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| Emner |
