00334nam a2200085Ia 4500008004100000100001200041245005900053260010500112650003100217220216s9999    xx            000 0 und d  aYan L S 0aInvisible earnings from the international rubber trade  bProceedings of the International Rubber Marketing Conference, 1983, Kuala Lumpur, Malaysia, p252-260  aInternational rubber trade