The Kilma-Njaro expedition : a record of scientific exploration in eastern equatorial Africa and a general description of the natural history, languages, and commerce of the Kilima-Njaro district / by H.H. Johnson, F.Z.S., F.R.G.S., Memb. Anthrop. Institute, etc., leader of the expedition, author of "The river Congo from its mouth to Bólóbó."