edited by D. G. Land and H. E. Nursten. edited by G. Bracchi, G. M. Nijssen. edited by C. H. Dash and H. E. H. Jones. edited by D. H. Hey and D. I. John. edited by D. C. E. Speller. edited by M.E. Fayed, L. Otten. edited by C. G. Scott and C. E. Reed. edited by D. A. Brannan, J. G. Clunie. edited by D. G. Ashwell and R. H. Gallagher. edited by H. E. Street.