http://mapmaker.rutgers.edu/355/links.html
The image above is a variation of a dot distribution map. Circles of varying sizes are used instead of dots. The circles indicate point data and the size of the circles indicate the degree of the variable that is measured. In this case the variables are range graded; that is to say that they represent predetermined sizes. For example, the rural populations are noted as either 500 or 1000 – 2500. This map demonstrates the population of the areas surrounding Detroit and Chicago.
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