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absorption acreage Agriculture American Annual Report assessments average bark consumption British North Borneo Buna butadiene capacity cents per lb Ceylon Chinese Committee competition coupons cultivation districts Dutch economic efficient producers estate area estate labourers estate producers estates and smallholdings estimates excess excess profits tax export rights figures French Indo-China Government guilder high-yielding higher holdings Immigration important increase Java latex London price Malay Malaya Malayan estates Malayan rubber Malayan smallholders manufacturers mature acre mature area million N.E.I. native native exports natural rubber Neoprene official output padi plantation planted area planters price of rubber producing territories quarter rate of release reduction repatriation replanting restriction result rice rubber estates rubber industry rubber production Rubber Regulation rubber-growing Sarawak Singapore slump South India statistics sterling companies Stevenson scheme stocks Straits dollars substantial Sumatra supply price synthetic rubber Table tappers tapping tons trees tyres under-assessment wages workers yields