Swanepoel, M.
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Soil fertility changes and crop yields from the first 4 yea..:

, In: Organic food systems: meeting the needs of Southern Africa,
Swanepoel, M. ; Auerbach, R. ; Mashele, N. J. - p. 303-324 , 2019
 
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Contributors:

, In: Reading as a Perceptual Process,
Beauvillain, Cécile ; Binns, Alice ; Bock, Jeannine... - p. xiii-xvii , 2000
 
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