Three case reports on the cometary plasma tail in the historical documents by Hayakawa Hisashi, Fujii Yuri I., Murata Koji, Mitsuma Yasuyuki, Cheng Yongchao, Nogami Nagatoshi, Ichikawa Kohei, Sano Hidetoshi, Tsumura Kohji, Kawamoto Yukiko, Nishino Masaki N.

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