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2012. California. Farmland Mapping and Monitoring Program. This polygon shapefile represents areas of important farmland in Napa County, California for 2012. Established in 1982, Government Code Section 655... California. Farmland Mapping and Monitoring Program.
2012. Napa County Geographic Information Systems . This layer is compoised of polygons depicting the Supervisorial Disricts a provided by the Napa County elections department .