Protected Areas Database of the United States (PAD-US) 4.0
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The USGS Protected Areas Database of the United States (PAD-US) is the nation's inventory of protected areas, including public land and voluntarily provided private...
美国地质调查局（United States Geological Survey, USGS）的美国保护区数据库（Protected Areas Database of the United States，简称PAD-US）是美国全国性的保护区资源清单，涵盖公共土地以及自愿提供相关信息的私人……
