edited by F.W. Wiffen and J.A. Spitznagel. edited by C.J. Williams & J.M.A. Whitehouse. edited by C.J. Williams, J.M.A. Whitehouse. edited by R.W. Field and J.A. Howell. edited by S.W. Hawking, W. Israel. edited by D.B. Ostrowsky, E. Spitz. edited by Diane E. Siegel. edited by S.W. Hawking, W Israel. edited by F.J. Dixon, Jr. & Henry G. Kunkel. edited by F. W. A. Hobart.