Estimating Domestic Self-Supply Water Use for the Delaware River Basin, 2000 U.S. Census Blocks
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According to the U.S. Geological Survey, an estimated 258 million people nationwide, or 86% of the U.S. population, relied on public water supplies for their...
据美国地质调查局（U.S. Geological Survey）估算，全美范围内共有2.58亿人口，占美国总人口的86%，其日常用水等依赖公共供水系统……
