2014. Cambridge (Mass.). Geographic Information Systems. This point layer contains locations of six types of historical markers throughout Cambridge, including blue oval historic markers, African American...
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2014. Cambridge (Mass.). Geographic Information Systems. This polygon layer contains buildings, sites, structures, objects, and districts that have been placed on the National Register of Historic Places ...
1830. University of Minnesota. Minnesota Population Center. This boundary file contains historic county boundaries for which the U.S. Census Bureau tabulated data and was produced by the Minnesota Population...
1830. University of Minnesota. Minnesota Population Center. This boundary file contains historic county boundaries for which the U.S. Census Bureau tabulated data and was produced by the Minnesota Population...
1830. University of Minnesota. Minnesota Population Center. This boundary file contains historic county boundaries for which the U.S. Census Bureau tabulated data and was produced by the Minnesota Population...
1830. University of Minnesota. Minnesota Population Center. This boundary file contains historic county boundaries for which the U.S. Census Bureau tabulated data and was produced by the Minnesota Population...
1900. University of Minnesota. Minnesota Population Center. This boundary file contains historic county boundaries for which the U.S. Census Bureau tabulated data and was produced by the Minnesota Population...
1900. University of Minnesota. Minnesota Population Center. This boundary file contains historic county boundaries for which the U.S. Census Bureau tabulated data and was produced by the Minnesota Population...
1900. University of Minnesota. Minnesota Population Center. This boundary file contains historic county boundaries for which the U.S. Census Bureau tabulated data and was produced by the Minnesota Population...
1900. University of Minnesota. Minnesota Population Center. This boundary file contains historic county boundaries for which the U.S. Census Bureau tabulated data and was produced by the Minnesota Population...
