2010. LAFCO of Napa County. Boundaries of the Spheres of Influence of Napa County Cities. Napa County (Calif.). County Of Napa.
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2010. Vestra Resources Inc. Redding CA. This layer is composed of polygons showing the Supervisorial Districts in Napa County as provided by the Napa County Elections Department. Napa County (Calif.). County Of Napa.