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- Snyman , D.D. 1989 . Verwantskap tussen veldtoestand, reënval en dierebelading in die Mopanieveld , Agric‐verhandeling, Universiteit van Pretoria . M.Sc.
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- Gebaseer op deel van die M.Sc. (Agric.)‐verhandeling van D.D. Snyman aan die Universiteit van Pretoria