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International opium conference, The Hague, December 1, 1911 - January 23, 1912 : summary of the minutes (unofficial)
- National Printing office,
- 1912.
- The Hague :
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Second international opium conference, The Hague, 1-9 July 1913 : summary of the minutes (unofficial)
- National Printing office,
- 1913.
- The Hague :