edited by G. G. Birch, K. J. Parker and J. T. Worgan. edited by G. C. Sih, R. P. Wei, F. Erdogan. edited by G. G. Birch and K. J. Parker. edited by G.G. Birch and K.J. Parker. edited by G.G. Birch, N. Blakebrough and K.J. Parker. edited by K. G. Stephens, I. H. Wilson and J. L. Moruzzi. edited by W. Bardsley, D. T. J. Hurle, and J. B. Mullin. edited by G. G. Roberts and M. J. Morant. edited by G.C. Sih, J.W. Provan. edited by M. J. Howes, D. V. Morgan.