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Onsong Ợ nóng Ôn Tông Nghiêu Onsen geisha Ó ngỗng Ốc song kinhTài liệu tham khảo
WikiPedia: Onsong http://english.chosun.com/w21data/html/news/200212... http://nkdb.org/bbs1/data/publication/Political_Pr... http://unstats.un.org/unsd/demographic/sources/cen... //tools.wmflabs.org/geohack/geohack.php?language=v... https://web.archive.org/web/20071017123327/http://... https://web.archive.org/web/20130228031922/http://...