Please read BHL's Acknowledgment of Harmful Content
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  1. By: Knight, Robert L.,
    Edition: [1st ed.]
    Publication info: Waltham, Mass., Chronica Botanica Co., 1948.
    Holding Institution: MBLWHOI Library
  2. By: Knight, Robert L., - Feng, Zefang - Pan, Jiaju
    Edition: Di 1 ban.
    Publication info: Beijing : Ke xue chu ban she, 1959.
    Holding Institution: Institute of Botany, Chinese Academy of Sciences