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WikiPedia: Iwama,_Ibaraki http://ibaraki-bryan.blogspot.com/ http://iwamaaikido.com/en/03.html/ http://www.city.kasama.lg.jp/ http://www.aikikai.or.jp/eng/ibaragi/ibaragi.htm http://www13.big.or.jp/~aikikai/ http://www13.big.or.jp/~aikikai/index.html https://id.ndl.go.jp/auth/ndlna/00376321 https://web.archive.org/web/20120306035653/http://... https://web.archive.org/web/20121105041433/http://... https://viaf.org/viaf/251757629