Range Graded Proportional Circle Map- Each circle represents a different value for the variable being considered, but only a set number of circles are used. In this instance, each circle represents the number of homes built before 1940 in each western US state at the time when this survey was conducted by the US Census Bureau in 1990. Only six circle sizes are used here (http://www.neiu.edu/~nerobert/391/cartographic.htm).
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