Two softcover academic journals about 6" x 9" in Very Good or better condition, really not much wrong with them. Includes Parts A and B, there was also a Part C but I do not have it. From a conference at VPI dating to August of 1963 at which Carl Sagan was a featured speaker and his essay is included. Individually numbered by the article so I don't know exactly how many pages but there is a lot of material included here. From the time when the first true communications satellites such as Telstar were going up into orbit. Great acquisition for collector or library.