Travels, researches, and missionary labors during an eighteen years' residence in Eastern Africa : together with journeys to Jagga, Usambara, Ukambani, Shoa, Abessinia and Khartum, and a coasting voyage from Mombaz to Cape Delgado
Krapf, J. L. (Johann Ludwig), 1810-1881; Ravenstein, Ernest George, 1834-1913