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International opium convention

1912 document which became the first international drug control treaty

Pronunciation
/ɪntəˈnaʃənəl ˈəʊpɪəm kənˈvɛnʃən/
/ˌɪntərˈnæʃənəl ˈoʊpiəm kənˈvɛntʃən/
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