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Wadeable Streams Assessment: A Collaborative Survey of
May 16, 2007 The NHD is a digitized version of 1:100K USGS topographic maps and shows both perennial and non-perennial (e.g., intermittent and ephemeral)
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National Hydrography Dataset | U.S. Geological Survey
The National Hydrography Dataset (NHD) represents the water drainage network of the United States with features such as rivers, streams, canals, lakes,
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