http://www.neiu.edu/~nerobert/391/cartographic.htm
A continuously variable proportional circle map is a variation of the proportional circle map. There are multiple variables that can be represented on the varying size circles. This circle map shows the aggregate population of German ancestry in Chicago's community areas based on 1990 data from the U.S. Census Bureau. One circle represents the number of persons of German ancestry in each community area. There are four circle sizes used, which indicate a logarithmic increase in the data represented.
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