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Books about Kotomichi:
Grass ?? - Okuma Kotomichi Songbook (Iwanami Bunko) (1938) ISBN: 4003026519 [Japanese Import] by Okuma Kotomichi (0100)
Okuma Kotomichi no sakura (Japanese Edition) by Rensei Kuwahara (1992)
Okuma Kotomichi to Hakata (Japanese Edition) by Rensei Kuwahara (1990)