Van Rensburg, S.W.J.; Thorburn, J.A.; Du Toit, P.J.
(Pretoria : The Government Printer, 1941)
1. An account is given of the results obtained over periods of 14 and 12 months respectively from a scheme applied to two South African Friesland herds and aiming at the eradication of chronic streptococcus mastitis from ...