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But there was a large group of friends who cooperated with us, and we with them, in uncovering the political dimensions of the international heroin traffic. There are many persons in Southeast Asia who helped us immeasurably by supplying us with firsthand accounts of incidents and other inside information whose names may not be mentioned out of respect for their personal safety, but whose assistance is greatly appreciated. This group includes students, past and present government officials, law enforcement personnel, and journalists.
Young et al. (Mon,) studied this question.