This is an example of a proportional circle map which uses graduated point symbols. The symbols in this case are circles which uses circle size to portray magnitude. The points are positioned near the center of each area and the size of the point represents the magnitude of the data or phenomena being measured. Here is a map created by the U.S. Census Berueau in 1990 to show the number of homes built before 1940 in each state illustrated.
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