http://lewishistoricalsociety.com/wiki2011/tiki-read_article.php?articleId=6
Dot Distribution Map
Dot distribution maps are used to represent spatial data through the use of dots. These dots are used to mark certain features in space. By doing this spatial patterns are created which may be clustered or dispersed. Cellular companies often use these maps to show where cell phone towers are in order to show a customer their service ranges.
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