edited by John C. Ballantyne and D.F.N. Harrison. edited by V. F. Zackay and H. I. Aaronson. edited by W. J. B. Chater and J. L. Harrison. edited by J. F. Davidson [and] D. Harrison. edited by M.M. Klepfer and D.B. Morrison. edited by G. L. Weissler and R. W. Carlson. edited by J. Carlsson and N.G. Ohlson. edited by J.R.A. Pearson and S.M. Richardson. edited by F.L. LaQue and H.R. Copson. edited by A. H. Rose and J. F. Wilkinson.