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Introduction - ecology and society in northeast African history, David M. Anderson and Douglas H. Johnson Part 1 Archaeological and historical perspectives - human adaptation and long-term climatic change in northeast Africa - and archaeological perspective, John A.J. Gowlett the great drought and famine of 1888-92 in northeast Africa, Richard Pankhurst and Douglas H. Johnson Emutai - crisis and response in Maasailand 1883-1902, Richard Waller. Part 2 Case studies - primary export crop production and the origins of the ecological crisis in Kordofan - the case of Dar Hamar, Mustafa Babiker Ahmed cultivation as a long-term strategy of survival - the Berti of Darfur, Ladislav Holy traders, farmers and pastoralists - economic adaptions and environmental problems in the southern Nuba mountains of the Sudan, Leif O. Manger adaptation to floods in the Jonglei area of the Sudan - an historical analysis, Douglas H. Johnson prelude to disaster - the case of Karamoja, Beverley Gartrell pastoralist migration and colonial policy - a case study from northern Kenya, Neal W. Sobania cultivating pastoralists - ecology and economy among the II Chamus of Baringo, 1840-1980, David M. Anderson looking for a cool place - the Mursi, 1890s to 1980s, David Turton history, drought and reproduction - dynamics of society and ecology in northeast Ethiopia, James McCann.
O'Brien et al. (1989) studied this question.