Edited by Fred M. Snell and Werner K. Noell. edited by John K. Tien and George S. Ansell. edited by Gerald J. Hine and Gordon L. Brownell. edited by William E. Caswell and George A. Snow. edited by George O. Abell and Barry Singer. edited by Fred. Seitz and David Turnbull. edited by Walter G. Berl and W. Richard Powell. edited by Clifton W. Pannell and Christopher L. Salter. edited by D. J. Bell and B. M. Freeman. edited by Fred Seitz and D. Turnbull.