Farm and farm-related employment by region: U.S. Department of Agriculture, maps.ers.usda.gov/mapimages/ers_reg_color.jpg
Top tea producers: Tip Top Tens, www.tiptoptens.com/2011/05/07/top-10-tea-producing-countries
World tea production: Food and Agricultural Organization of the United Nations.
World coffee production: Food and Agricultural Organization of the United Nations.
Average price of soybeans, wheat, and corn: Economic Research Service, U.S. Department of Agriculture.