http://www.geog.le.ac.uk/russianheartland/DemographicMaps/images/PopulationMaps/RaionMaps/7RaionPopDenPerCh8902.jpg
A bivariate choropleth map displays two variables on a map by combining two different sets of symbols or colors. It is a variation of simple choropleth map that portrays two separate sets of data at the same time. The idea of this particular type of map is to simplify the realtionship between two variables.
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