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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Du, Yaquan (杜亜泉)
    Edition: Di 4 ban.
    Publication info: Shanghai, Shang wu yin shu guan, [1922]
    Holding Institution: University of Toronto - Cheng Yu Tung East Asian Library
  2. By: Du, Yaquan (杜亜泉)
    Publication info: shang wu yin shu guan
    Holding Institution: Institute of Botany, Chinese Academy of Sciences