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Contributions of Phosphorus from Groundwater to Streams in the Piedmont, Blue Ridge, and Valley and Ridge Physiographic Provinces, Eastern United States 科技报告
来源:US Geological Survey (USGS). 出版年: 2011
作者:  Denver, Judith M. jmdenver@usgs.gov;  Cravotta, Charles A. III cravotta@usgs.gov;  Ator, Scott W. swator@usgs.gov;  Lindsey, Bruce D. blindsey@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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