http://www.iupui.edu/~geotech/g337/g337_old/exer7/exer7.htmlA range graded proportional circle map is a map that uses circles and a key to give certain types of geographic information such as population, industry, cattle, and so on. The thing that separate range grades from a continuously variable proportional map is that there is a set number of circle sizes that are used. The map above shows the gross domestic product in the world from 1996.
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