Dr Rotberg's Africa - The Rise of Nationalism in Central Africa, The Making of Malawi and Zambia, 1873–1964. By Robert Rotberg. Harvard University Press, 1965. Pp. 362. - Christian Missionaries and the Creation of Northern Rhodesia, 1880–1924. By Robert Rotberg. Princeton University Press, 1965. Pp. 240. - A Political History of Tropical Africa. By Robert Rotberg. New York: Harcourt, Brace and World, Inc.1965. Pp. 440, maps, illustrations.