1990. Cambridge (Mass.). Geographic Information Systems and U.S. Department of Commerce, Bureau of the Census, Geography Division. This polygon layer contains the 802 census blocks that make up the City of Cambridge for the 1990 Census. Data from the 1990 US Census. Adjusted Ce...
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2000. Cambridge (Mass.). Geographic Information Systems and U.S. Department of Commerce, Bureau of the Census, Geography Division. This polygon layer contains the 886 census blocks that make up the City of Cambridge for the 2000 Census. Data from US Bureau of the Census. GIS Da...