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Archives I presume?
When rubber and ivory no longer yielded sufficient profits due to depletion or to the situation on the international markets, the exploitation of the Congolese, Rwandese and Burundi soil began. These soils were generally rich in ores and natural resources and particluarly fertile in some areas. Map entitled Belgisch-Congo, voornaamste voortbrengselen uit het delfstoffen-, planten- en dierenrijk. Verkeerswegen, Congo op economisch gebied, 1937-1938, drawn by M. Norbert Laude, administrator of the Colonial College of Belgium and professor in economic earth sciences. Map taken from the De Wildeman collection.
NAB, Archives INEAC, no. 7449.