by C.J. Cowper and A.J. DeRose. by W.S.Fowler and J.Pidcock. by D.J. Littler and J.F. Raffle. by P. E. Conner and E. E. Floyd. by M. W. Porter and R. C. Spiller. by D. F. Spooner and W. H. Grinsted. by J.W. Weller and A. Youle. by R.E. Kaiser and E. Oelrich. by A. C. Ainger and H. G. Wintle. by D.R. Strayer and D.H. Gillespie.