https://www.e-education.psu.edu/geog486/book/export/html/1796
This map falls under the category of a proportional circle map, however, it does not have a set size of circles to measure the data proportionaly. Additional information may be available through pie charts.
In this map, the proportion of different types of meat that were sent to Paris butcheries from different regions in France are shown with circle graphs. This map was created by Charles Joseph Minard and goes as far back as 1858.
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