1. Economics in the air;Ausubel,1980
2. With Geldof in Africa;Blundy,1985
3. State of the World, 1985;Brown,1986
4. A reappraisal of rainfall trends in the Sahel;Dennett;J. Clim.,1985
5. Gaps in the water provision map of the Sudan;El Sammani;Sudan Notes Rec.,1978