Ethiopian Science and Technology CommissionUnited Nations UniversityTewolde Berhan G. Egziabher2007-11-121987-04-012007-11-12198292-808-0390-5http://hdl.handle.net/10625/9075Text31 p.Application/pdfenRESEARCH AND DEVELOPMENTAGRICULTURAL ENGINEERINGTRADITIONAL TECHNOLOGYNEW TECHNOLOGYETHIOPIASCIENTISTSAGRICULTURAL POPULATIONBook