[by] D. M. Young and A. D. Crowell. by A. S. Hornby and E. C. Parnwell. by W. R. Schoeller and A. R. Powell. by T. F. West and G. A. Campbell. by N. T. M. Dennis and T. A. Heppell. by D. F. Spooner and W. H. Grinsted. by H. D. Jocelyn and B. P. Setchell. by D. O. Hall and K. K. Rao. by D.T.E. Hunt and A.L. Wilson. by D. C. Miles [and] J. H. Briston.