Du Toit, R.; Goosen, P.J.; De Kock, G.v.d.W.
(Pretoria : The Government Printer, 1949)
Sheep treated at Onderstepoort with emulsions containing 5 per cent.
and 2•5 per cent. para para isomer of D.D.T. on selected sites on the
fleece, and subsequently tested on these treated sites by artificially induced ...