![](http://personalpages.manchester.ac.uk/staff/m.dodge/cybergeography/atlas/mids_af_i_gr_c_large.gif)
Statistical maps are expressed as rates, ratios, percentages, or other statistical measures. They are used to display the distribution of a certain variable over a geographic area. This statistical maps of the Internet was produced by John S. Quarterman in 1990.
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