edited by H. Beck and H.-J Guntherodt. edited by Francis A. Gunther. edited by M. H. Gutcho. edited by F. Beck and J. B. Lloyd edited by H. Bennett. edited by Ernest C. Bernhardt. edited by H. E. Street. edited by H.W. Reinhardt. edited by J.J. Becker and J.C. Bonner. edited by C.H. Massen & H.J. Van Beckum.