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Archives I presume?
Already during the era of Congo Free State, in 1894, Lake Kivu was an apple of discord between Belgium, Germany and Britain. In 1910, an agreement was reached about the 700 km long boundary between Lake Tanganyika and Lake Albert. Map regarding the Kivu issue since the relinquishment of Congo Free State to Belgium, [1908-1909].
NAB, Archives Leon van der Elst, no. 151.