Nieschulz, Otto; Bedford, G.A.H.; Du Toit, Rene M.; Union of South Africa. Dept. of Agriculture; Du Toit, P.J.(Union of South Africa : Dept. of Agriculture, 1934)
Nieschulz, Otto; Bedford, G.A.H.; Du Toit, Rene M.; Union of South Africa. Dept. of Agriculture; Du Toit, P.J.(Union of South Africa : Dept. of Agriculture, 1934)