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Archives I presume?
In 1900, the botanic test gardens (Jardin d’essais) of Eala were created. The introduction and acclimatisation of plants often took place via the test gardens of Eala and Kisantu (Lower Congo), with the support of the colonial greenhouses of Laeken. Golden Book/visitors register of the botanical gardens of Eala near Coquilhatville, 1904-1949.
NAB, Archives INEAC, no. 10399.