by De Brouwer, C.H.M. (North West Department of Agriculture and Environmental Affairs, Potchefstroom (South Africa). North West Agricultural Development Inst.)
Published in Farmer's Weekly (South Africa) (08.08.1997)

by De Brouwer, C.H.M. (North West Department of Agriculture and Environmental Affairs, Potchefstroom (South Africa). North West Agricultural Development Inst.)
Published in North West Focus (South Africa) (1996)

by De Brouwer, C.H.M. (North West Department of Agriculture and Environmental Affairs, Potchefstroom (South Africa). North West Agricultural Development Inst.)
Published in Northwest Focus (South Africa) (1998)