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Changes in water budgets and sediment yields from a hypothetical agricultural field as a function of landscape and management characteristics--A unit field modeling approach 科技报告
来源:US Geological Survey (USGS). 出版年: 2012
作者:  Roth, Jason L. jroth@usgs.gov;  Capel, Paul D. capel@usgs.gov
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Environmental factors that influence the location of crop agriculture in the conterminous United States 科技报告
来源:US Geological Survey (USGS). 出版年: 2011
作者:  Baker, Nancy T. ntbaker@usgs.gov;  Capel, Paul D. capel@usgs.gov
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