1. National Hydrography Dataset (NHD) Reach: Pennsylvania
2004. USGS. A compilation of all medium resolution reach layers from National Hydrography Datasets in or adjacent to Pennsylvania.
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2. WPC HUC12 (includes percentage land-use): Western Pennsylvania
2004. USGS. 12 digit USGS hydrological unit code (HUC) watersheds within Pennsylvania. Includes percentage land-use information from the National Land Cover Da...