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  1. 1
    by Wanigaratne, R. D.
    Published 1979
    Colombo : Agrarian Research and Training Institute, 1979.
    v, 60 p. : map ; 30 cm.
  2. 2
    Published 1979
    [Colombo] : Information Service, Ministry of Lands & Land Development and Mahaweli Development, 1979.
    xi, 124 p., [38] leaves of plates : ill., maps ; 26 cm.
  3. 3
    by Peiris, G. H.
    Published 1987
    Colombo, Sri Lanka : Agrarian Research and Training Institute, 1987.
    viii, 129 p. : maps ; 29 cm.
  4. 4
    Published 1972
    [Colombo] : Republic of Sri Lanka, Ministry of Irrigation, Power, and Highways, Mahaweli Development Board, 1972-
    v. : ill. ; 31 x 43 cm.

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