NHD Basin Boundaries developed from the Watershed Boundary Dataset (WBD).
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These data were digitized and edited from best available sources at a scales ranging from 1:24,000, or better, up to 1:2,000,000. This data is not intended to be the authoritative source for hyrologic units, but only as a reference to NHD data that has so
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Steven.Nechero@ftw.usda.gov
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Steve Nechero
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