颁布单位：[University of the Free State] |  颁布时间：1971 |  实施时间：1971 |  学科分类：[["Plants,, Cultivated","Plants,, Cultivated, --, Free, State","Plants, --, Effect, of, hail, on","Harvest, and, climate","Dissertation, (M.Sc.Agric., (Agricultural, Sciences))--University, of, the, Free, State,, 1971"]]

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