00400nam a2200085Ia 4500008004100000100001800041245005800059260017500117650002200292220216s9999    xx            000 0 und d  aPethiyagoda U 0aPlantation sector changed challenges and perspectives  bProceedings of the International Rubber Conference, Colombo, 1984, V1. Part 1; p19-46Proceedings of the International Rubber Conference, Colombo, 1984, V1. Part 1; p47-58  aRubber plantation