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研究报告 [4]
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2017 [2]
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Methods for computing water-quality loads at sites in the U.S. Geological Survey National Water Quality Network [研究报告]
10.3133/ofr20171120U.S. Geological Survey. 2017-01-01
Lee, Casey J.;  Murphy, Jennifer C. jmurphy@usgs.gov;  Crawford, Charles G. cgcrawfo@usgs.gov;  Deacon, Jeffrey R. jrdeacon@usgs.gov
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A method for addressing differences in concentrations of fipronil and three degradates obtained by two different laboratory methods [研究报告]
10.3133/ofr20171056U.S. Geological Survey. 2017-01-01
Crawford, Charles G. cgcrawfo@usgs.gov;  Martin, Jeffrey D. jdmartin@usgs.gov
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Assessing total nitrogen in surface-water samples--precision and bias of analytical and computational methods [研究报告]
U.S. Geological Survey. 2013-01-01
Rus, David L. dlrus@usgs.gov;  Patton, Charles J. cjpatton@usgs.gov;  Mueller, David K. mueller@usgs.gov;  Crawford, Charles G. cgcrawfo@usgs.gov
View  |  Adobe PDF(3592Kb)  |  View/Download：23/2
 
Century-scale perspective on water quality in selected river basins of the conterminous United States [研究报告]
U.S. Geological Survey. 2012-01-01
Stets, Edward G.;  Kelly, Valerie J. vjkelly@usgs.gov;  Broussard, Whitney P. III;  Smith, Thor E. tesmith@usgs.gov;  Crawford, Charles G. cgcrawfo@usgs.gov
Adobe PDF(35127Kb)  |  View/Download：20/8
 

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