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  1. By: Gilbert, Joseph Henry, Sir,
    Publication info: London,Harrison,1891.
    Holding Institution: University of California Libraries (archive.org)
    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 (archive.org)
    Subjects: Agriculture  Experimentation  Rothamsted Experimental Station, Harpenden, Englan