@BOOK {LAL:1979n, title = {Soil erosion problems on an alfisol in western Nigeria and their control: IITA monograph No. 1}, author = {Lal, R. }, series = {IITA monograph No. 1}, year = {1979}, publisher = {International Institute of Tropical Agriculture (IITA)}, address = {Ibadan, Nigeria}, note = {208p.}, }