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Vulnerability of shallow ground water and drinking-water wells to nitrate in the United States: Model of predicted nitrate concentration in U.S. ground water used for drinking (simulation depth 50 meters) -- Input data set for population density (gwava-dw_popd)

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This data set represents 1990 block group population density, in people per square kilometer, in the conterminous United States. This data set represents The data set...

本数据集收录了1990年美国本土毗邻地区(conterminous United States)范围内的普查街区组(block group)人口密度数据,统计单位为人/平方千米。该数据集……

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