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  1. By: Gilbert, Joseph Henry,
    Publication info: London, Harrison, 1891
    Holding Institution: University of California Libraries
    Subjects: Agriculture  Experimentation  Rothamsted Experimental Station, Harpenden, Englan  
  2. By: Tipper, C. J. R.
    Publication info: London, C. Lockwood, 1897
    Holding Institution: University of British Columbia Library
    Subjects: Agriculture  Experimentation  Rothamsted Experimental Station, Harpenden, Englan