Nieschulz, O.; Du Toit, R.M.; Du Toit, P.J.
(Pretoria : The Government Printer, 1937)
During the summer of 1932-1933 our work on the natural transmission
of horsesickness was continued at Onderstepoort.
The summer was extraordinarily dry, the total rainfall from
November, 1932, to April, 1933, being only ...