G Series
- G-574 SF Avram Davidson The Kar-Chee Reign / Ursula K. Le Guin Rocannon's World (1966)
- G-576 SF John T. Phillifent (as John Rackham) Danger From Vega / Avram Davidson Clash of Star-Kings (1966)
- G-580 SF Mack Reynolds Dawnman Planet / Claude Nunes Inherit the Earth (1966)
- G-585 SF John W. Campbell The Planeteers / The Ultimate Weapon (1966)
- G-588 SF Lin Carter The Star Magicians / John Baxter The Off-Worlders (1966)
- G-592 SF John T. Phillifent (as John Rackham) The Beasts of Kohl / John Brunner A Planet Of Your Own (1966)
- G-597 SF Ursula K. Le Guin Planet of Exile / Thomas M. Disch Mankind Under the Leash (1966)
- G-602 SF Jack Jardine and Julie Jardine (jointly as Howard L. Cory) The Mind Monsters / Philip K. Dick The Unteleported Man (1966)
- G-606 SF John T. Phillifent (as John Rackham) Time to Live / Lin Carter The Man Without a Planet (1966)
- G-609 SF Philip E. High Reality Forbidden / A. Bertram Chandler Contraband From Otherspace (1967)
- G-614 SF Walt Richmond and Leigh Richmond Shock Wave / Frederick L. Shaw, Jr. Envoy to the Dog Star (1967)
- G-618 SF Emil Petaja The Stolen Sun / H. Warner Munn The Ship From Atlantis (1967)
- G-623 SF Philip E. High These Savage Futurians / John T. Phillifent (as John Rackham) The Double Invaders (1967)
- G-632 SF A. Bertram Chandler Nebula Alert / Mack Reynolds The Rival Rigelians (1967)
Read more about this topic: List Of Ace SF Double Titles
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