Total acres of land in orchards is illustrated in this univariate choropleth map of the U.S. from 2002. The data is broken down into counties and only six categories are being used. I am not sure what type of classification technique they are using but maybe they started with natural breaks and then rounded off the numbers to make it easier to read. In 2002, Florida and California had a lot of acreage dedicated to orchards.Link to website source:
http://www.nass.usda.gov/research/atlas02/index.html
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