A form of book binding, where books are bound in pairs back-to-back (such that the book has two front covers, each of which is upside down with respect to the other). - see Ace Double.
To be found in pages: Ace Books | Spoil Of Yesterday | Fullness Of Time | Word Not Written | Acorna's People | Acorna's Quest | Acorna's Rebels | Acorna's Search | Acorna's Triumph | Acorna's World | Acorna The Unicorn Girl | Air Apparent | Martian Odyssey And Other Great Science Fiction Stories | Spell For Chameleon | Aurora | Battle Circle | Belgarath The Sorcerer | Blue Adept | Caliban | Castle Of Wizardry | Castle Roogna | Centaur Aisle | Chaining The Lady | Chapterhouse Dune | Charisma | Children Of Dune | Chimera | Continuum No 1 | Continuum No 2 | Continuum No 3 | Continuum No 4 | Crewel Lye | Crystal Line | Crystal Singer | Cube Route | Currant Events | Darkover Landfall | Demon Kind | Demons Don't Dream | Double Exposure | Dragon On A Pedestal | Dune | Dune Butlerian Jihad | Dune: House Atreides | Dune: House Corrino | Dune: House Harkonnen | Dune Messiah | Dune: The Battle Of Corrin | Dune: The Butlerian Jihad | Dune: The Machine Crusade | Earthman, Go Home! | Eric | Executive | Faun And Games | First Warning | Forward The Foundation | Foundation | Foundation And Chaos | Foundation And Earth | Foundation And Empire | Foundation's Edge | Foundation's Fear | Foundation's Friends | Foundation's Triumph | Geis Of The Gargoyle | Get Off The Unicorn | God Emperor Of Dune | Golem In The Gears | Harpy Thyme | Have Robot Will Travel | Hawkmistress! | Heaven Cent | Heretics Of Dune | His Dark Materials | Hunters Of Dune | I Robot | Irulan Of Dune | Isaac Asimov's Caliban | Isaac Asimov's Inferno | Isaac Asimov's Utopia | Isle Of View | Jessica Of Dune | Jumper Cable | Juxtaposition | Key To Chroma | Key To Havoc | Key To Liberty | Killashandra | Kirlian Quest | Legends Of Dune | Leto Of Dune | Let The Spacemen Beware | Lyra's Oxford | Magician's Gambit | Magic Of Xanth | Man From Mundania | Mayday Orbit | Mercenary | Mirage | Mirror Image | More Magic Of Xanth | Neq The Sword | Night Mare | Nimisha's Ship | Northern Lights | Ogre, Ogre | Once Upon A Time In The North | Out Of Phaze | Partnership | Paul Of Dune | Pawn Of Prophecy | Pebble In The Sky | Pet Peeve | Phaze Doubt | Piers Anthony's Visual Guide To Xanth | Plasm | Polgara The Sorceress | Politician | Prelude To Foundation | Queen Of Sorcery | Question Quest | Refugee | Robot Adept | Roc And A Hard Place | Sandworms Of Dune | Second Foundation | Second Wave | Sharra's Exile | Soma | Songs Of Muad'dib | Sos The Rope | Spellbound Xanth | Split Infinity | Star Of Danger | Statesman | Stork Naked | Stormqueen! | Stranger Than You Think | Swell Foop | Template | Test 1 | Test 2 | Test 4 | Test Sub 1-1 | Test Sub 1-2 | Test Sub 1-3-1 | Amber Spyglass | Bloody Sun | Book Of Dust | Caves Of Steel | City Who Fought | Coelura | Color Of Her Panties | Continuing Xanth Saga | Currents Of Space | Dastard | Disappearing Future | Dune Collection | Great Dune Trilogy | Heirs Of Hammerfell | Iron Maiden | Magic Of Xanth | Naked Sun | Notebooks Of Frank Herbert's Dune | Planet Savers | Rest Of The Robots | Rivan Codex | Road To Dune | Second Great Dune Trilogy | Ship Avenged | Ship Errant | Ship That Sailed The Time Stream | Ship Who Sang | Ship Who Searched | Ship Who Won | Source Of Magic | Stars, Like Dust | Subtle Knife | Sword Of Aldones | Warlock In Spite Of Himself | Winds Of Darkover | Third Watch | Thousandstar | Two To Conquer | Two To The Fifth | Unicorn Point | Up In A Heaval | Utopia | Vale Of The Vole | Var The Stick | Vicinity Cluster | Viscous Circle | We Claim These Stars | Who? | Xanth The Quest For Magic | Xone Of Contention | Yon Ill Wind | Z-Lensman | Zombie Lover |
