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1by Perera, M. P.
Published 1978Colombo : Agrarian Research & Training Institute, 1978.28 p., [2] leaves of plates : graphs ; 30 cm.“...Agrarian Research & Training Institute,...”
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2by Perera, M. P.
Published 1976Colombo : Agrarian Research and Training Institute, 1976.23 p. : maps ; 30 cm.“...Agrarian Research and Training Institute,...”
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3by Ryan, M. (Michael)
Published 1981Colombo, Sri Lanka : Agrarian Research and Training Institute, 1981.v, 62 p. ; 30 cm.“...Agrarian Research and Training Institute,...”