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Okayama Okayama (thành phố) Okayama Kazunari Okaya, Nagano Okayama Tetsuya Okay Airways OK Okazaki Shinji Okazaki Ritsuko Okada IzōTài liệu tham khảo
WikiPedia: Okayama_(thành_phố) http://id.loc.gov/authorities/names/n80065901 http://d-nb.info/gnd/4102047-9 http://id.ndl.go.jp/auth/ndlna/00259336 http://www.city.okayama.jp/ http://www.city.okayama.jp/english/index.html http://www.city.okayama.okayama.jp/ //tools.wmflabs.org/geohack/geohack.php?language=v... https://viaf.org/viaf/254704805 https://commons.wikimedia.org/wiki/Category:Okayam... https://www.worldcat.org/identities/containsVIAFID...