Estimated equivalent population using public supply groundwater in the conterminous United States, CEM
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The population using public supply drinking water was mapped in two ways: the census enhanced method (CEM) evenly distributes the population across the census block-...
使用公共供水的人口通过两种方式开展空间分布制图:普查增强法(Census Enhanced Method, CEM)将人口均匀分布于普查街区范围内——



