Beukes MJdP Prof, NHK, Kriel, South Africa

Boshoff PB Dr, NHK, Vereeniging, South Africa

Breytenbach JH Dr, NHK, Wonderboom-Suid, South Africa

Coetzer WJ Dr, NHK, Welkom, South Africa

Els GvR Ds, NHK, Brakenhurst, South Africa

Kloppers WC Dr, NHK, Rietvallei, South Africa

Le Roux C Ds, NHK, Stellenbosch, South Africa

Schutte PJW Dr, NHK, Klerksdorp, South Africa

Van der Merwe JC Dr, NHK, Kempton Park, South Africa

Van der Merwe JF Ds, NHK, Philedelphia, South Africa

Van Eck E Dr, NHK, Moot, Pretoria, South Africa

Van Wyk GMJ Dr, NHK, Vanderbijlpark, South Africa