edited by R.T. Van de Walle. edited by L. van der Hammen. edited by M.L. van Beusichem. edited by J. D. Beadle. edited by E. M. L. Beale. edited by E. van Oye. edited by Willian F Waller. edited by C.J. van Rijsbergen. edited by E. Wolfendale. edited by William A. Gale.