Walsh, R.P.D., Hulme, M. and Campbell, M., 1988
Recent rainfall changes and their impact on hydrology and water supply in the semi-arid zone of Sudan.
Geographical Journal 154, 181-198
(keywords: rainfall climate change hydrology Sudan desertification water precipitation Africa)
Hulme, M. and Walsh, R.P.D., 1985
A generation of drought that triggered disaster.
New Scientist, 1451, 11.
(keywords: drought historical impacts)