edited by M. E. Van Valkenburg. edited by Wade Van Valkenburg. edited by A. A. H. Drinkenburg. edited by P. W. J. Van Rensburg. edited by Mr. P. A. Rottenburg. edited by A. I. Ginzburg. edited by James H. Rittenburg. edited by L. D. Rozenberg. edited by Leo van Velzen. edited by W. G. Gottenberg.