Optimizing livelihood and environmental benefits from crop residues in smallholder crop-livestock systems in western Oromia: PRA case studies conducted across eight villages around Nekemte, Ethiopia - Lule, D.; Kaba, W.; Degefa, A.; Degefa, K.; Negash, M.; Mekonnen, Kindu; Leta, Gerba; Duncan, Alan J. (International Livestock Research Institute, 2012)