https://www.e-education.psu.edu/geog160/c3_p14.html
Proportional circle maps are proportional symbol maps that use circles specifically. It is a widely-used form of thematic mapping that compares many areas in a geographic region, states in this example. Each area is then given a circle proportional to the data being processed. In this example, the circles are comparing population and federal expenditures by state.
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