by A. P. Dunlop and F. N. Peters. by R. B. Heslop and K. Jones. by J. H. Bowen and E. F. O. Masters. by James B. Sumner and G. Fred Somers. by R. H. Boll and others. by R.B. Heslop and P.L. Robinson. edited by J. W. S. Hearle and R. H. Peters.