active 12th century Yan Yu

active 12th century Yan Yu (Yü Yen, Danqiu Yan, Yiqing Yan, Yu Yen, 嚴羽)

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active 12th century Yan Yu (active 12th century Yan Yu, Yü Yen, Danqiu Yan, Yiqing Yan, Yu Yen, 嚴羽)

Books by active 12th century Yan Yu