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  1. By: Perold, Abraham Izaak, - South Africa. Dept. of Agriculture.
    Publication info: Pretoria, Govt. Print. and Stationery Office, 1913
    Holding Institution: University of California Libraries
  2. By: Perold, Abraham Izaak, - South Africa. Dept. of Agriculture.
    Publication info: Pretoria, Govt. Print. and Stationery Off, 1916
    Holding Institution: University of California Libraries