- Author: V. B. John M.Sc. C. Eng. M.I.M. M.I.M.M. (auth.)
- Language: English
- Year: 1983
- Author: Vernon John M.Sc. C.Eng. M.I.M.M. A.I.M. (auth.)
- Language: English
- Year: 1975
- Author: V. B. John M.Sc. C.Eng. M.I.M.M. A.I.M. (auth.)
- Language: English
- Year: 1974