Tor Double Novels
Tor Doubles are a series of science fiction books published by Tor Books between 1988 and 1991, 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 ISBN numbers for the United States.| # | First book | Second book | Publication date | ISBN |
| 1 | Arthur C. Clarke A Meeting with Medusa | Kim Stanley Robinson Green Mars | October 1988 | 0-8125-3362-3 |
| 2 | Greg Bear Hardfought | Timothy Zahn Cascade Point | November 1988 | 0-8125-5971-1 |
| 3 | Robert Silverberg Born With The Dead | Brian W. Aldiss The Saliva Tree | December 1988 | 0-8125-5952-5 |
| 4 | John Varley Tango Charlie and Foxtrot Romeo | Samuel R. Delany The Star Pit | January 1989 | 0-8125-5956-8 |
| 5 | Poul Anderson No Truce With Kings | Fritz Leiber Ship of Shadows | February 1989 | 0-8125-5958-4 |
| 6 | Barry B. Longyear Enemy Mine | John Kessel Another Orphan | March 1989 | 0-8125-5963-0 |
| 7 | Vonda N. McIntyre Screwtop | James Tiptree, Jr. The Girl Who Was Plugged In | April 1989 | 0-8125-4554-0 |
| 8 | Leigh Brackett The Nemesis From Terra | Edmond Hamilton Battle for the Stars | May 1989 | 0-8125-5960-6 |
| 9 | Isaac Asimov The Ugly Little Boy | Theodore Sturgeon The , the , and Boff | June 1989 | 0-8125-5966-5 |
| 10 | Robert Silverberg Sailing to Byzantium | Gene Wolfe Seven American Nights | July 1989 | 0-8125-5924-X |
| 11 | James Tiptree, Jr. Houston, Houston, Do You Read? | Joanna Russ Souls | August 1989 | 0-8125-5962-2 |
| 12 | Roger Zelazny He Who Shapes | Kate Wilhelm The Infinity Box | September 1989 | 0-8125-5879-0 |
| 13 | Kim Stanley Robinson The Blind Geometer | Ursula K. Le Guin The New Atlantis | October 1989 | 0-8125-0010-5 |
| 14 | Poul Anderson The Saturn Game | Gregory Benford and Paul A. Carter Iceborn | November 1989 | 0-8125-0277-9 |
| 15 | Jack Vance The Last Castle | Robert Silverberg Nightwings | December 1989 | 0-8125-0194-2 |
| 16 | James Tiptree, Jr. The Color of Neanderthal Eyes | Michael Bishop And Strange At Ecbatan The Trees | January 1990 | 0-8125-5964-9 |
| 17 | L. Sprague de Camp Divide and Rule | Leigh Brackett The Sword of Rhiannon | February 1990 | 0-8125-0362-7 |
| 18 | C.L. Moore Vintage Season | Robert Silverberg In Another Country | February 1990 | 0-8125-0193-4 |
| 19 | Fritz Leiber Ill Met in Lankhmar | Charles de Lint The Fair in Emain Macha | March 1990 | 0-8125-0821-1 |
| 20 | L. Sprague de Camp The Wheels of If | Harry Turtledove The Pugnacious Peacemaker | April 1990 | 0-8125-0202-7 |
| 21 | Roger Zelazny Home is the Hangman | Samuel R. Delany We, In Some Strange Power's Employ, Move On A Rigorous Line | May 1990 | 0-8125-0983-8 |
| 22 | Leigh Brackett The Jewel of Bas | Karen Haber Thieves' Carnival | June 1990 | 0-8125-0272-8 |
| 23 | Norman Spinrad Riding The Torch | Joan D. Vinge The Tin Soldier | July 1990 | 0-8125-0551-4 |
| 24 | Roger Zelazny The Graveyard Heart | Walter Jon Williams Elegy For Angels And Dogs | August 1990 | 0-8125-0275-2 |
| 25 | John M. Ford Fugue State | Gene Wolfe The Death of Doctor Island | September 1990 | 0-8125-0813-0 |
| 26 | John Varley Press Enter■ | Robert Silverberg Hawksbill Station | October 1990 | 0-8125-5948-7 |
| 27 | Orson Scott Card Eye For Eye | Lloyd Biggle, Jr. The Tunesmith | November 1990 | 0-8125-0854-8 |
| 28 | Kim Stanley Robinson A Short Sharp Shock | Jack Vance The Dragon Masters | December 1990 | 0-8125-0895-5 |
| 29 | Ian Watson Nanoware Time | John Varley The Persistence of Vision | January 1991 | 0-8125-5940-1 |
| 30 | Poul Anderson The Longest Voyage | Steve Popkes Slow Lightning | March 1991 | 0-8125-1170-0 |
| 31 | Gordon R. Dickson Naked To The Stars | Gordon R. Dickson The Alien Way | February 1991 | 0-8125-0396-1 |
| 32 | Harlan Ellison Run For The Stars | Jack Dann and Jack C. Haldeman II Echoes of Thunder | April 1991 | 0-8125-1180-8 |
| 33 | Mike Resnick Bwana | Mike Resnick Bully | May 1991 | 0-8125-1246-4 |
| 34 | Damon Knight Rule Golden | Damon Knight Double Meaning | June 1991 | 0-8125-1294-4 |
| 35 | Dean Ing Silent Thunder | Robert A. Heinlein Universe | July 1991 | 0-8125-0265-5 |
| 36 | Fritz Leiber Conjure Wife | Fritz Leiber Our Lady Of Darkness | August 1991 | 0-8125-1296-0 |
In 1985, Tor published two Keith Laumer novellas in the dos-a-dos format with the "Tor Double" label, but it was not part of the series.
At least one more in the series was prepared but never published: Esther Friesner's Yesterday We Saw Mermaids paired with Lawrence Watt-Evans's The Final Folly of Captain Dancy would have been series number 37.