2007. California. Office of Statewide Health Planning and Development. This polygon shapefile represents medical service study areas (MSSA) in California for 2007. MSSAs are the defined geographic analysis unit for the... California. Office of Statewide Health Planning and Development.
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2007. California. Office of Statewide Health Planning and Development, InfoUSA, and U.S. Census Bureau. The 2007 MSSA Detail layer (developed during July 2009 - July 2010) is an update to the 2005 version. The 2000 Medical Service Study Area (MSSA) Ce... California. Office of Statewide Health Planning and Development.