by Crafford, D.J, Nott, R.W
Published in Technical communication - South Africa, Dept. of Agriculture and Fisheries (1981)

by Pretorius, J.P, Crafford, D.J
Published in Maize news (1978)

by Crafford, D.J, Nott, R.W
Published in Farming in South Africa (1972)

by Crafford, D.J, Nott, R.W
Published in Farming in South Africa (1971)