[by] H.L. Hamburger [and] M.E. Grimshaw. by H.J. Frost and M.F. Ashby. by H.S. Hall and S.R. Knight. by D. F. Spooner and W. H. Grinsted. by D.L. Klingman and W.C. Shaw. by Alfred B. Searle and Rex W. Grimshaw. by H. A. J. Pieters and J. W. Creyghton. by H. L. Edlin and M. Nimmo. by H. S. Hall and S. R. Knight. by H.A. Treble and G.H. Vallins.