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2010. Teale Data Center. California Watershed Map: Version 2.2. This layer is composed of polygons at depict the boundary of the various watershed areas in Napa County. Napa County (Calif.). County Of Napa.
2009. Butte County (Calif.) -- Geographic Information Systems. This polygonal dataset shows all lakes, large rivers, and small water bodies within Butte County, California as shown on USGS 1:24000 maps and upda...