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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Reed, Howard S. (Howard Sprague), - Halma, Frederick Ferdinand,
    Publication info: Berkeley, University of California Press, 1919
    Holding Institution: University of California, Davis Libraries
    Subjects: Growth (Plants)  Plant growth inhibiting substances  
  2. By: Norris, Robert F. - University of Alberta. Dept. of Plant Science.
    Publication info: [1964]
    Holding Institution: University of Alberta Library
    Subjects: Grasses  Growth  Plant growth inhibiting substances