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Archives I presume?
By setting up the experimental farmstead 'Hubert Droogmans' about 10 km from the centre of Elisabethville (Lubumbashi) in the 1920s, the choice for a scientific and systematic approach towards the colonisation and cultivation problem in Katanga was made. Note of the head of agricultural service regarding the development of different plant species in the arboretum of C.S.K., 1928.
NAB, Archives Hubert Droogmans, no. 282.