J. Verne ; simplified by H.E. Palmer. J. Verne ; abridged by H.E. Palmer. J. Verne ; simplified by M. West. J. Verne ; tr. & abri. by H.E. Palmer. A. Hailey ; simplified by N. Wymer. D. Defoe ; simplified by M. West. W. Collins ; simplified by G.C. Thornley. Jules Verne ; simplified by Michael West. W. Collins ; simplified by E.M. Attwood. H.G. Wells ; simplified by T.S. Gregory.