Ace Double Novel Books
Publisher 1
 | Junkie / Narcotic Agent | Paperback |
Publisher Series 2
 | Dr. Futurity / Slavers of Space | Mass-Market Paperback |
 | Vulcan's Hammer / The Skynappers | Mass-Market Paperback |
| Junkie / Narcotic Agent | Paperback |
| Dr. Futurity / Slavers of Space | Mass-Market Paperback |
| Vulcan's Hammer / The Skynappers | Mass-Market Paperback |