Henderson, W.W.; Pan-African Agricultural and Veterinary Conference (1929 : Pretoria, South Africa)(Union of South Africa, Dept. of Agriculture; Pretoria : University of Pretoria, Dept. of Library Services (Digital publisher), 1930)
Poisson, H.; Pan-African Agricultural and Veterinary Conference (1929 : Pretoria, South Africa)(Union of South Africa, Dept. of Agriculture; Pretoria : University of Pretoria, Dept. of Library Services (Digital publisher), 1930)