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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Clark, W. A.
    Edition: 2d ed. rev. and enl.
    Publication info: London, L. U. Gill, 1906, 1907
    Holding Institution: Cornell University Library
  2. By: Clark, W. A. - Elliott, Clarence.
    Publication info: London, L.U. Gill, 1901
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library