1981. U.S. Geological Survey. Library locations were mapped for the Napa County Baseline Data report. Many of the locations were selected from the U.S. Geological Survey's Geog... Napa County (Calif.). County Of Napa.
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.
1997. Teale GIS Solution Group. COVERAGE DESCRIPTION: The 'PRECIPITATION' layer represents lines of equal rainfall (isohyets) based on long-term mean annual precipitation data com... Napa County (Calif.). County Of Napa.
1998. Vestra Resources Inc. Airport clear zone locations as determined by the Napa County General Plan, 1998-2000. Napa County (Calif.). County Of Napa.
2002. LAFCO of Napa County. This polygonal dataset shows the boundaries of the Spheres of Influence for cities in Napa County, California as of 2002. A sphere of influence is ...