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研究报告 [3]
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2016 [2]
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Transport of nitrogen and phosphorus in the Cedar River Basin, Iowa and Minnesota, 2000–15 [研究报告]
10.3133/sir20185090U.S. Geological Survey. 2018-01-01
Kalkhoff, Stephen J. sjkalkho@usgs.gov
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The effect of restored and native oxbows on hydraulic loads of nutrients and stream water quality [研究报告]
U.S. Environmental Protection Agency. 2016-01-01
Kalkhoff, Stephen J. sjkalkho@usgs.gov;  Hubbard, Laura E. lhubbard@usgs.gov;  Joseph P.Schubauer-Berigan
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Phosphorus in sediment in the Kent Park Lake watershed, Johnson County, Iowa, 2014–15 [研究报告]
10.3133/ds1001U.S. Geological Survey. 2016-01-01
Kalkhoff, Stephen J. sjkalkho@usgs.gov
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