The natural fracture of pebbles from the Batoka Gorge, northern Rhodesia, and its bearing on the Kafuan industries of Africa.- Cambridge - Clark, J. Desmond (John Desmond), 1916-2002 (Proceedings of the Prehistoric Society; 24. 1958, no. 4, S. 64-77: 5 Ill.; 4 Taf., 1958)