1. Ley, Willy. The Conquest of Space. 1949. Signed and inscribed by WILLY LEY on title "To Rocco Manzo with my best wishes."
2. Ryan, Cornelius, editor. Across the Space Frontier. 1952. Signed by WILLY LEY on title.
3. Ryan, Cornelius, editor. Conquest of the Moon. 1953. Signed by VON BRAUN on title.
4. Von Braun, Wernher and Willy Ley. The Exploration of Mars. 1956. Signed by WILLY LEY on title. Gift inscription on title.
Together, 4 volumes. All New York: Viking Press. Illustrations by Chesley Bonestell, Fred Freeman, and Rolf Klep. 10 by 8 inches. Original cloth. Dust-jackets. First editions in book form.