http://go.owu.edu/~jbkrygie/krygier_html/geog_353/geog_353_lo/geog_353_lo07.html
"Unclassed" choropleth maps: the number of categories is equal to the number of data values
Each value has a unique symbol
- ex) range of values from 0 to 100 represented with 0% to 100% black
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