1. Water Requirements of Main Crops in Menoufia District;El Shal,1954
2. Problems of soil evaluation in the Sudan;Finck;J. Soil Sci.,1961
3. Soil profile in the eastern Gezira;Greene;J. Agr. Sci.,1928
4. Reports on the Gezira soils;Soil Survey Staff,1968
5. Soil Classification, a Comprehensive System, Supplement to 7th Approximation;Soil Survey Staff,1967