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2005. Department of Conservation & Development, Contra Costa County. This dataset represents the Census Tracts within Contra Costa, California. Latest data revision occurred in November 2012; Data was mapped and prov...
2003. Department of Telecommunications and Information Services. US Census 2000 Tract Geography modified to conform with SFGIS Library Geography (Streets, Lakes, et al.). Water areas have been clipped from this l... San Francisco (Calif.). Department Of Telecommunications and Information Services.