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English: Cartogram of presidential election results by county (1928). Colors based on Colorbrewer 2.0.
Date
Source
Own work. Original shapefile downloaded from:
Minnesota Population Center. National Historical Geographic Information System: Version 2.0. Minneapolis, MN: University of Minnesota 2011. http://www.nhgis.org
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Minnesota Population Center. National Historical Geographic Information System: Version 2.0. Minneapolis, MN: University of Minnesota 2011.
If possible, citations should also include the URL for the NHGIS site: http://www.nhgis.org"
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