With an introd. by R.P. Blackmur. With an introd. by Martin Gardner. With an introd. by Lord Horder. With an introd. by W. T. Stearn. with an introd. by] Israel Gerver. With an introd. by Frank Wells. with an introd. by Viola Meynell. With an introd. by George Sherburn. With an introd. by Nathan M. Newmark. With an introd. by Wernher von Braun.