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    2021. Retrieved 29 July 2021. Koyama, Masato. "Jōhei nana-nen (937) funka" 承平七年(937)噴火 [Eruption in the 7th year of Jōhei (937)] (in Japanese). Shizuoka...
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    ISBN 4-8406-2315-5. 二中歴3 第十一~第十三(尊経閣善本影印集成) ISBN 4-8406-2316-3. 所功, (1977). 日本の年号 揺れ動く<元号>問題の原点. 雄山閣. 井上清, (1989). 元号制批判 やめよう元号を. 明石書店. ISBN 4-7503-0236-8...
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