edited by E. M. L. Beale. edited by J. D. Beadle. edited by E. Wolfendale. edited by John D. Beadle. edited by R. T. Bottle. edited by R.T. Van de Walle. edited by John A. Heddle. edited by A. Blikle. edited by H.-J. Bolle. edited by J.W. Palen.