颁布单位：[University of the Free State] |  颁布时间：1986 |  实施时间：1986 |  学科分类：[["Senior, Secondary, school, phase","Black, children","Pedagogic, activity","Secondary, education","Thesis, (Ph.D., (Education))--University, of, the, Free, State,, 1986"]]

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颁布单位：[University of the Free State] |  颁布时间：1986 |  实施时间：1986 |  学科分类：[["Plant, water, relations","Sucrose, accumulation","Crop, growth","Thesis, (Ph.D., (Agricultural, Meteorology))--University, of, the, Free, State,, 1986"]]

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