![](//2.bp.blogspot.com/_fgY6akITad4/SfSvpQ7-RMI/AAAAAAAAADU/Rba_R1ukrlA/s400/Proportional.png)
This map shows the different population density of each of the counties. The size of each circle corresponds to a specific value, given in the table on the left. This makes the map a range-graded dot density map.
http://www.photographicviewpoints.com/Geo486/images/Lesson8/Proportional.png
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