Belmont Double novels
Belmont Doubles are a series of science fiction books published by Belmont Books between 1967 and 1969, mostly in tête-bêche format. The series was inspired by the Ace Doubles, published between 1952 and 1973.
Titles in the series
This list is complete and includes the catalog numbers used by the publisher.| # | First book | Second book | Publication date | Cat. no. |
| 1 | Lin Carter The Flame of Iridar | Kris Neville Peril of the Starmen | May 1967 | B50-759 |
| 2 | Harlan Ellison Doomsman | Lee Hoffman Telepower | August 1967 | B50-779 |
| 3 | Kris Neville Special Delivery | Dave Van Arnam Star Gladiator | October 1967 | B50-788 |
| 4 | Lin Carter The Thief of Thoth | Frank Belknap Long ... And Others Shall Be Born | January 1968 | B50-809 |
| 5 | William Tenn A Lamp for Medusa | Dave Van Arnam The Players of Hell | June 1968 | B60-077 |
| 6 | Robert Bloch Ladies' Day | Robert Bloch This Crowded Earth | August 1968 | B60-080 |
| 7 | John Brunner Father of Lies | Bruce Duncan Mirror Image | October 1968 | B60-081 |
| 8 | John Brunner The Evil That Men Do | Lin Carter The Purloined Planet | May 1969 | B60-1010 |
Belmont Tower doubles
A few titles in the series were reprinted, and in one instance remixed, by Belmont's successor Belmont Tower. This list may not be complete. It includes the catalog numbers used by the publisher.| # | First book | Second book | Publication date | Cat. no. |
| 1 | Harlan Ellison Doomsman | Lin Carter The Thief of Thoth | July 1972 | 50244 |
| 2 | Robert Bloch Ladies' Day | Robert Bloch This Crowded Earth | December 1974 | 50759 |
| 3 | John Brunner The Evil That Men Do | Lin Carter The Purloined Planet | March 1975 | 50787 |