• "First printing: may, 1961"; no number line
• There is a sixteen page insert between pages 96 & 97 of B&W photos. All the sources are given on the copyright page. Three of these are also on the back cover, while a completely separate photo is on the front cover, credited to NASA, UPI. [Alan Shepard on cover photo became the first American, to travel into space on May 5th, 1961].
• There are two appendices: Official Biographies of the Astronauts, and A Glossary of Space Terms.
• Interior drawings are credited to Fred L. Wolff on the title page
