This is a bivariate choropleth map of Russia's Federal District that shows population density in 2002 and population change from 1989-2002 taken from: http://www.geog.le.ac.uk/russianheartland/DemographicMaps/images/PopulationMaps/RaionMaps/7RaionPopDenPerCh8902.jpgThis is a type of choropleth map that compares two variables.
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