Watershed Boundaries for the U.S. Geological Survey National Water Quality Network
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The National Water Quality Network (NWQN) for Rivers and Streams includes 113 surface-water river and stream sites monitored by the U.S. Geological Survey (USGS)...
面向河流与溪流的国家河流水质监测网（National Water Quality Network, NWQN）包含113个地表水河流与溪流监测点位，这些点位由美国地质调查局（U.S. Geological Survey, USGS）开展监测……
