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1Published 1977[Colombo] : Agrarian Research and Training Institute, 1977.iii, 76 p. : graphs, map ; 30 cm.“...Agrarian Research and Training Institute,...”
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2by Lebbe, Ishak
Published 1977Colombo : Agrarian Research and Training Institute, 1977.40 p. ; maps ; 30 cm.“...Agrarian Research and Training Institute,...”
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3by Krause, Georg, fl. 1977-
Published 1977Colombo : Agrarian Research and Training Institute, 1977.33 p. : maps ; 30 cm.“...Agrarian Research and Training Institute,...”