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Catchment-level estimates of nitrogen and phosphorus agricultural use from commercial fertilizer sales for the conterminous United States, 2012 [研究报告]
10.3133/sir20185145U.S. Geological Survey. 2019-01-01
Stewart, Jana S. jsstewar@usgs.gov;  Schwarz, Gregory E. gschwarz@usgs.gov;  Brakebill, John W. jwbrakeb@usgs.gov;  Preston, Stephen D. spreston@usgs.gov
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