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Utsuro-bune Utsugi Rumi Utsul Utsukushii Mukashi Ussuri Utsunomiya Shion Ussuriysk Utnoor Usurbil Utsunomiyajō no tatakaiTài liệu tham khảo
WikiPedia: Utsuro-bune http://www.iwasebunko.com/ http://www.yaji-kita.com/ufo-1.html http://ibarakinews.jp/news/news.php?f_jun=13351084... http://ibarakinews.jp/news/newsdetail.php?f_jun=13... http://ibarakinews.jp/news/newsdetail.php?f_jun=14... http://home.e-catv.ne.jp/naka/mukasi-hanasi/denset... http://gogosima-ikou.nsf.jp/densetu/haikaigogo.htm... http://yunzu.qee.jp/translations/utsurobune/utsuro... //www.worldcat.org/search?fq=x0:jrnl&q=n2:0194-673... //www.worldcat.org/search?fq=x0:jrnl&q=n2:0308-589...