Used

Japanese literature The fifteenth Shogun, Okita Soji, Gaiden no ue

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Japanese literature Koken 260000 koku (upper)

Used

Japanese literature Okita Soji Gaiden, the fifteenth Shogun (lower grade)

Used

Japanese literature Masterpieces of Torimonocho, supervised by Sorojin Tsukikage, Kazuo Hyogo NIWATA

Used

Japanese literature Tokugawa Ieyasu (new version)