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WikiPedia: Nam_Hoa_Kỳ http://www.britannica.com/eb/art-3822 http://www.lib.niu.edu/ipo/1996/iht329633.html http://docsouth.unc.edu/index.html http://research.unc.edu/endeavors/spr97/south.html http://www.unc.edu/depts/csas/ http://www.unc.edu/news/archives/jun99/reed16.htm http://www.ling.upenn.edu/phono_atlas/maps/MapsS/M... http://www.census.gov/geo/www/us_regdiv.pdf http://www.gutenberg.org/dirs/etext01/pofos10.txt http://www.invasive.org/eastern/biocontrol/25Kudzu...