Watersheds for U.S Geological Survey National Stream Quality Accounting Network (NASQAN) sampling sites 1996-2000.
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A digital representation of the watersheds of 43 sites on large river systems sampled by the National Stream Quality Accounting Network (NASQAN) of the U. S....
美国国家河流质量核算网络（National Stream Quality Accounting Network, NASQAN）所采样的大型河流水系43个点位的流域数字化表征数据集...
