颁布单位：[University of the Free State] |  颁布时间：2000 |  实施时间：2000 |  学科分类：[["Tractor","Replacement","Model","Simulation","Decision, support","Repair, cost","Salvage, value","Reliability","Tax","Farm, tractors, --, Economic, aspects","Farm, tractors, --, Cost, of, operation","Decision, making","Thesis, (Ph.D., (Agricultural, Economics))--University, of, the, Free, State,, 2000"]]

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颁布单位：[University of the Free State] |  颁布时间：1998 |  实施时间：1998 |  学科分类：[["Livestock, productivity, --, Technological, innovations, --, South, Africa, --, Qwaqwa","Agriculture, --, South, Africa, --, Qwaqwa, --, Technology","Livestock, --, Economic, aspects, --, South, Africa, --, Qwaqwa","Veterinary, services, --, South, Africa, --, Qwaqwa","Thesis, (Ph.D., (Agriculture, Economics))--University, of, the, Free, State,, 1998"]]

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