1997. MassGIS (Office : Mass.). The Massachusetts State Senate Legislative Districts (1993) datalayer reflects the State Senate district boundaries as defined by Chapter 274 of th... Office of Geographic and Environmental Information (MassGIS).
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1991. MassGIS (Office : Mass.). The political boundary datalayer is a 1:25,000 scale datalayer containing the boundaries of the 351 communities in Massachusetts. The seaward bound... Office of Geographic and Environmental Information (MassGIS).
2000. MassGIS (Office : Mass.). The Designated Shellfish Growing Area (DSGA) datalayer was compiled by the Department of Fisheries, Wildlife and Environmental Law Enforcement's (D... Office of Geographic and Environmental Information (MassGIS).