History of opium in Sri Lanka.
D003132:Commerce; D049669:History, 16th Century; D049670:History, 17th Century; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D007878:Legislation as Topic; D009892:Opium / Q000266:history*; D013188:Sri Lanka
D009892:Opium