http://www.neiu.edu/~nerobert/Cartography.htm
Proportional circle maps associate a particular symbol, typically a circle, with a particular point on a map, such as the center of a city, or the capital city of a country. The diameter of the circle represents some function of the quantity being visualized. The proportional circle map above is a map of the western U.S. illustrating the American Indian population of each state based on Census Bureau data from 1990.
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