http://www.geog.ucsb.edu/~jeff/gis/choropleth_maps.html
Description: Bivariate Choropleth Maps display two different variables on one map usually with colors and symbols. Here are four different examples of bivariate choropleth maps. Each of these examples displays two variables related to crimes rates in the US in 2003 and the results of the 2004 election. Each map uses colors and lines to show the data.
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