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Archives I presume?
Thanks to a selective policy, the experimental farmstead 'Hubert Droogmans' produced enough milk to supply the town with milk products. Also, the colonists were supplied with dairy cattle and drainage and irrigation methods were developed. In 1923, a laboratory for cattle doctors was set up in order to control the quality of the milk, the feeding and supervision of the livestock, the composition of a herbarium and the development of vaccines. Photographs of the arboretum, the forest cultivation and the tree nursery of Lubumbashi, 1928.
NAB, Archives Hubert Droogmans, no. 283.