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WikiPedia: Onsen http://japan-onsen.com/japan_onsen.htm http://www.onsentipster.com http://www.secret-japan.com/onsen/ http://d-nb.info/gnd/1070678562 http://www.sentoguide.info http://id.ndl.go.jp/auth/ndlna/00568894 http://www.onsenjapan.net/ http://www.konyoku.org/ https://www.japantimes.co.jp/life/2016/12/10/lifes... https://japan-magazine.jnto.go.jp/en/amusing_20101...