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  1. 1
    by Petch, T.
    Published 1925
    Colombo : Government Printing Dept., 1925.
    256 p. ; 25 cm.
  2. 2
    by Wimaladharma, Kapila P.
    Published 1977
    Peradeniya : UNDP/FAO Agricultural Diversification Project, Ministry of Plantation Industries, 1977.
    34 p. ; 30 cm.
  3. 3
    by Ranasinghe, W.
    Published 1977
    [Colombo] : Agrarian Research and Training Institute, [1977?]
    iv, 208 p. ; 33 cm.

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