
Relations of nonpoint-source nitrate and atrazine concentrations in the High Plains aquifer to selected explanatory variables in six Nebraska study areas
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U.S. Dept. of the Interior, U.S. Geological Survey, U.S. Geological Survey, Branch of Information Services [distributor]
1996

U.S. Dept. of the Interior, U.S. Geological Survey, U.S. Geological Survey, Branch of Information Services [distributor]
1996

U.S. Dept. of the Interior, U.S. Geological Survey, U.S. Geological Survey, Branch of Information Services [distributor]
1996

U.S. Dept. of the Interior, U.S. Geological Survey, U.S. Geological Survey, Branch of Information Services [distributor]
1996