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