edited by J. N. Anderson and P. E. Queneau. edited by E. S. Pearson and H. O. Hartley. edited by B. Henderson and A. E. Hughes. edited by K. D. Patterson and Kerry Schott. edited by M.B. Anderson and S. J. R. Powles. edited by C. C. Addison and D. B. Sowerby. edited by W. D. Hanson and H. F. Robinson. edited by G. N. Henderson and John Stratton. edited by J. F. Davidson and D. Harrison. edited by O.D. Anderson and M.R. Perryman.