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Archives I presume?
Note of NAB, Archives Hubert Droogmans to and from King Leopold II about resources such as gold and copper found in Katanga by the Tanganyika Concessions Ltd. company. Discovery confirmed by professor Henri Buttgenbach from Liège and the administrator of Union Minière, 1905.
NAB, Archives NAB, Archives Hubert Droogmans, no. 16.