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：[Stellenbosch University] |  颁布时间：2000 |  实施时间：2000 |  学科分类：[["Air, travel",, "Tourism",, "Aeronautics,, Commercial, --, Passenger, traffic",, "Airlines, --, Management",, "Airlines, --, Rates",, "Airlines, --, Cost, of, operation",, "Air, travel, --, South, Africa",, "Tourism, --, South, Africa",, "Travel, agents, --, South, Africa",, "Travel, clubs, --, --, South, Africa",, "Airline, capacity",, "Dissertations, --, Economics",, "Theses, --, Economics"]]

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