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Archives I presume?
Thomas Kanza was the first Congolese who obtained a university diploma. "This lettre marks a new stage in the development of society", E. van der Straeten wrote in a note to Van Bree, about a letter by Thomas Kanza, 1952.
NAB, Archives Société générale de Belgique, Comité Intérieur Colonial, folder 'Thomas Kanza'.