http://www.crs.gov
http://www.fas.usda.gov/info/factsheets/Panama/Panama1Pager07.pdf
http://www.fas.usda.gov/info/factsheets/Panama/Panamaoverall0707.pdf
http://www.fas.usda.gov/
http://www.fas.usda.gov/info/factsheets/Panama/Panamaoverall0707.pdf
http://www.fas.usda.gov/info/factsheets/Colombia/Colombiadetailedfinal0308.pdf
http://www.fas.usda.gov/info/factsheets/Colombia/usColombiaTPAfactsheets.asp
http://www.fas.usda.gov/info/factsheets/Korea/KORUSFactSheet-Updated10-29-08.pdf
http://www.fas.usda.gov/info/factsheets/korea.asp
http://www.fas.usda.gov/info/factsheets/Korea/us-koreaftafactsheets.asp
http://www.finance.senate.gov/hearings/testimony/2009test/