http://pubs.usgs.gov/fs/2005/3051/
The map shown above ia an unstandardized choropleth map. The main fact about these choropleth maps is that they do not aerially average the data in which the map represents. One interesting thing about these maps is that they really do their own thing when it comes to comaprison to other types of choropleth maps. The choropleth map illustrates the total water withdrawals across the United States in direct relation to livestock, mining, agriculture, etc.
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