Adventure In Space Travel by Willy Ley
"Adventure In Space: Space Travel" by Willy Ley (1958 General Mills/Simon & Schuster - illustrated by John Polgren - this book is amazing...utterly astounding, and I need to scan more of this.
The preface reads: "TO THE READER: Space Travel is the fourth and last in a series on Adventure In Space. This series is the story of the rocket age, of how Man will escape from the air ocean surrounding the earth and conquer the open space beyond it. The age has already begn; its beginning was signalled by the putting of the first artificial satellite into an orbit arond the earth."
Update (10/14/10) - check out John Polgreen's original artwork for this.