By Cracknell, D.G.
By Bryant, David, Kershaw, D.G.
By Goyder, D.G.
By Dr. D.G. Hessayon, Hessayon, D.G.
By Brown, C.R., Evans, D.G., Jenkins, M.
By Ferriman, D.G., Gilliland, I.C.
By Purseglove, John William, Green, C L, Brown, D.G., Robbins, S.R.J.
By Rees, D.G.
By Fraser, D.G.
By Howell, D.G.
By Conway, D.G.
By Gee, D.G., Pease, V.
By Pritchard, D.G.
By Matthews, D.G., S.M.
By Charlton, D.G.
By Finlay, D.G.
By Compton, D.G.
By Butler, D.G.
By Association for Science Education, Newman, D.G.
By Grahame-Smith, D.G., J. K. Aronson
By Walkey, D.G.
By Hanson, D.G.
By Wells, D.G.