1. A comparison of work outputs of draught oxen;O'Neill;J. Agric. Engng Res.,1989
2. Improving the Design of Animal and Tractor Drawn Farm Implements and Draught Animal Power Utilization. Research Proposal;Kaumbutho,1990
3. Utilization and management of draft animals with special reference to the African Buffalo (Syncerus Coffer) in captivity;Mwanzia,1995
4. Production and Use of Agricultural Machinery in Kenya;Muchiri,1980
5. Test of tillage tools II. Effect of several factors on the reaction of fourteeninch moldboard ploughs;Randolph;Agri. Engng,1938