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1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, and 2011. County of San Mateo Information Services Department. This polygon shapefile depicts land areas within the County of San Mateo, California that receive tax breaks under the Williamson Act. The Californ... County of San Mateo Information Services Department.
2014. von Dohlen, Jerry. This polygon shapefile depicts boundaries of Williamson Act Parcels for ranches in the unincorporated areas of the County of Humboldt, California. ... Humboldt County Planning and Building Department.