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Brill‎(1956)‎

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By van der Waal C. S.   in African Studies

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Routledge Ltd‎(2012)‎

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By Knox N. M.   Skidmore A. K.   Schlerf M.   de Boer W. F.   van Wieren S. E.   van der Waal C.   Prins H. H. T.   Slotow R.   in International Journal of Remote Sensing

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Taylor & Francis Ltd‎(2010)‎

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By van der Waal C   in African Journal of Range and Forage Science

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Taylor & Francis Ltd‎(2005)‎

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By Wessels DCJ   van der Waal C   de Boer WF   in African Journal of Range and Forage Science

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Taylor & Francis Ltd‎(2007)‎

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