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2013 [1]
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Nitrate in the Mississippi River and its tributaries, 1980-2010: an update [研究报告]
10.3133/sir20135169U.S. Geological Survey. 2013-01-01
Murphy, Jennifer C. jmurphy@usgs.gov;  Hirsch, Robert M. rhirsch@usgs.gov;  Sprague, Lori A. lsprague@usgs.gov
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