by R. A. Robinson and R. H. Stokes. by R.A. Robinson and R.H. Stokes. by E. A. Guggenheim and R. H. Stokes. by Carl G. Johnson and Wm. R. Weeks. by G. D. Hobson and E. N. Tiratsoo. by Adam Robinson and John Katzman. by J.S. Rowlinson and B. Widom. by I. F. Henderson and W. D. Henderson. by J. H. Simpson and R. S. Richards. I.D. Hodkinson and M.K. Hughes.