This is a univariate choropleth map of water in the United States taken from: http://content.answers.com/main/content/wp/en/thumb/2/28/180px-Choropleth.gif
Univariate choropleth maps display a single set of data.
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This is a univariate choropleth map of water in the United States taken from: http://content.answers.com/main/content/wp/en/thumb/2/28/180px-Choropleth.gif
Univariate choropleth maps display a single set of data.
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