This is a lot of three vintage science fiction novels published by Ace Books in the 1960s. The books are in paperback format and feature numbered copies. The novels are written by mixed authors and cover topics related to science. They are intended for an adult audience and are first edition prints. The lot is a vintage collection and is a great addition to any science fiction enthusiast's library.

Binding tight. Cover good. Little to no markings. Minimal wear and tear. Each book contains two novels. Please see pics.

Titles include: 1. The Space-Time Juggler by John Brunner (1963, F-227) 2. The Astronauts Must Not Land by John Brunner (1963, F-227) 3. I Want the Stars by Tom Purdom (1964, F-289) 4. Demons' World by Kenneth Bulmer (1964, F-289) 5. Second Ending by James White (1962, F-173) 6. The Jewels of Aptor by Samuel R. Delany (1962, F-173)