edited by H. J. Gray and Alan Isaacs. edited by E. L. Grove, A. J. Perkins. edited by D. J. Evans. edited by H.J. Greenwood. edited by R. J. Hance. edited by D. J. Greenland and M. H. B. Hayes. edited by Ted J. Biggerstaff, Alan J. Perlis. edited by C. J. Bunyan edited by H. G. Reading. edited by H. Grunewald.