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Archives I presume?
First of all, the existing ivory trade was taken over. "I write you a few more words tonight so that you recommend to everyone around you who knows what Stanley writes regarding ivory and trade to keep silent". Letter from Leopold II to Strauch, 1881. - Microfilm copy of a received letter from the sovereign to Strauch, 1881.
NAB, Papers Maximilien Strauch, Film 2740. The original document is preseved at the NPO Dynasty and Cultural Heritage.