n Oorsig oor die koringsiektesituasie in Suid-Afrika, met spesiale verwysing na stamroes, en oorwegings in verband met 'n nasionale koringsiekteprogram

De Jager, J. N. W.(Johan Nicolaas Wilhelm) (1980)

Proefskrif (Ph. D. (Agric.)) -- Universiteit van Stellenbosch, 1980.

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Thesis

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