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Books about Ryosen:
Nihon riberarizumu no ryosen (Japanese Edition) by Kiyoko Takeda (1987)
Tsunashima Ryosen: Sono hito to shiso (Japanese Edition) by Shigeru Yukiyasu (1997)
Tsunashima Ryosen to sono shuhen (Japanese Edition) by Michio Kawai (1989)
Wiki information Ryosen:
Ryosen Tezuka was a doctor.
Tezuka Ryosen (old Ryoan) is a fictional character from the Japanese manga and anime series Hidamari no Ki.