Richard Pankhurst made significant contributions to the study of history in Ethiopia (see a listing of some of his works here). In this book, "The History of Famine and Epidemics in Ethiopia Prior to the Twentieth Century" (1985), published by the Relief and Rehabilitation Commission, Richard Pankhurst brings together a series of others works:
What I liked from the book is the clear outline of the complex interaction of factors that result in famine and epidemic. Rarely is it ever a single factor. This approach may have been more common in historical works than in development studies in decades past. Pankhurst outlines how in the 1888-92 famine, the first factor was animal disease, which contributed to agricultural failure as fields could not be plowed. The failure of rains also contributed to poor agricultural yields and a hot and dry season resulted in more locust, which compounded the losses. As famine struck, prices for all food commodities rose, deepening the food insecurity situation. As people began to die, poor sanitation resulted in the spread of human disease, and further loss of human life.