MECKLENBERG, Adolphus Frederick (Duke of). In the Heart of Africa, London, 1910, 4°, coloured frontispiece, plates, folding maps, illustrations, original cloth (spine and upper cover slightly faded) -- KUMM, Karl. From Hausaland to Egypt, London, Constable & Co., 1910, 8°, portrait, plates, including several coloured (of butterflies), illustrations, original cloth (spine faded, extrtemities rubbed) -- BARNS, T. Alexander. The Wonderland of the Eastern Congo, London & New York, G.P. Putnam, [1922], 8°, plates, maps, illustrations, original cloth, t.e.g.; and 7 others. (10)