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 [Widget], the [Wadget], 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

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.