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WikiPedia: Đồng quê http://www.rural.gc.ca/home_e.phtml http://www.statcan.gc.ca/bsolc/olc-cel/olc-cel?cat... http://www.shepscenter.unc.edu/research_programs/r... http://www.census.gov/geo/www/ua/ua_2k.html http://nces.ed.gov/surveys/ruraled/index.asp http://www.ers.usda.gov/Briefing/Rurality/ http://www.ers.usda.gov/emphases/rural/ http://ric.nal.usda.gov http://www.cfra.org/ http://www.fao.org/sd/erp/index_en.htm