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Trends in nutrient concentrations, loads, and yields in streams in the Sacramento, San Joaquin, and Santa Ana Basins, California, 1975-2004 科技报告
来源：US Geological Survey (USGS). 出版年： 2011
作者:  Kratzer, Charles R.;  Kent, Robert rhkent@usgs.gov;  Seleh, Dina K.;  Knifong, Donna L. dknifong@usgs.gov;  Dileanis, Peter D.;  Orlando, James L.
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Concentrations, loads, and yields of nutrients and suspended sediment in the South Pacolet, North Pacolet, and Pacolet Rivers, northern South Carolina and southwestern North Carolina, October 2005 to September 2009 科技报告
来源：US Geological Survey (USGS). 出版年： 2011
作者:  Journey, Celeste A. cjourney@usgs.gov;  Caldwell, Andral W. acaldwel@usgs.gov;  Feaster, Toby D. tfeaster@usgs.gov;  Petkewich, Mattew D.;  Bradley, Paul M. pbradley@usgs.gov
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