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.
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2011. MarinMap. Precipitation data created under the recommendation of consultant Bill Vandivere for the Marin Countywide Plan. Data was digitized from "Isohyetal... San Rafael (Calif.). County Of Marin.