A map of the United States of America. It shows the borders of each county. Each county is filled in with different shades on a gradient from white to green. A key shows that the color represents TRx with white indicating 1 TRx and the darkest color green indicating up to 10000 TRx. A footer on the map indicates that the graphic was created in Tableau.
Description 
Type
Category
Source 1 of 2
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Date
2015
Collection
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Date
2012
Collection
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