Univariate choropleth maps displays a single set of data in a map. The single set of data displayed in this map is Hay harvested by acre in the US in 2002. According to this map the largest number of hay harvested was concentrated in the North West.
http://www.nass.usda.gov/research/atlas02/Crops/Hay%20and%20Forage%20Crops%20Harvested/Hay%20-%20All%20Hay%20Including%20Alfalfa,%20Other%20Tame,%20Small%20Grain,%20and%20Wild,%20Harvested%20Acres-choropleth%20map.gif
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