edited by R.O. Ritchie and J. Lankford. edited by R.H. Pritchard and I.B. Holland. edited by G. Milazzo and M. Blank. edited by R.G. White and J.G. Walker. edited by C.R. Brundle and A.D. Baker. edited by M. J. Blackie and J. B. Dent. edited by R.W. Eglese and G.K. Rand. edited by R.O. McGachie and A.G. Bradley. edited by Colin Ratledge and John Stanford. edited by R. Mackay and A. J. Mountford.