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U.S. Geological Survey
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1. Airports in Napa County
1997. U.S. Geological Survey. The locations of features labeled as "Airports" in the U.S. Geological Survey's Geographic Names Information System (GNIS) datafiles, 1997. The GN... Napa County (Calif.). County Of Napa.
2. Locations of houses of worship in Napa County
2006. U.S. Geological Survey. Locations of houses of worship in Napa County for the Napa County Baseline Data Report. Many of the locations were selected from the U.S. Geologic... Napa County (Calif.). County Of Napa.