Some quotes from 19th.C. sources:From: What Led to the Discovery of the Source of the Nile (1864), by John Hanning Speke:Eastern Congo: The population is considerable, and they live in mushroom huts, situated on the high flats and easier slopes, where they cultivate the manioc, sweet potato, maize, millet, various kinds of pulse, and all the common vegetables in general use about the country.