Books starting with O
- Operation Bounce House
- Operation Boyfriend
- Operation Breakthrough
- Operation Bunny
- Operation Certain Death The Inside Story of the SAS's Greatest Battle
- Operation Chastise: The RAF's Most Brilliant Attack of World War II
- Operation Chiffon
- Operation Columba: the Secret Pigeon Service : the untold story of World War II resistance in Europe
- Operation Dark Heart Spycraft and Special Ops on the Frontlines of Afghanistan -- and The Path to Victory
- Operation Deathmaker
- Operation Desolation
- Operation Drumfire
- Operation Endgame
- Operation: Endgame
- Operation Excalibur
- Operation Il Duce
- Operation Inferno
- Operation Iraqi freedom
- Operation Isis
- Operation Jinnah
- Operation Liberty
- Operation Longlife
- Operation Mincemeat
- Operation Misfit
- Operation Ordinary Live the Truth, Resist Democratic Socialism
- Operation Ouch!
- Operation Paperclip
- Operation Pax The Paper Thunderbolt
- Operation pucker up
- Operation Relentless: The Hunt for the Richest, Deadliest Criminal in History
- Operation Screwtape The Art Of Spiritual War
- Operation Shambling Tide
- Operation Sisterhood
- Operation: Square Peg / Enchantress of Venus
- Operation Squish!
- Operation Suicide
- Operation Titanic
- Operation Trojan Horse
- Operation Trojan War
- Operation Underworld How the Mafia and U.S. Government Teamed Up to Win World War II
- Operation Werewolf
- Operative Microsurgery
- Operative Sequence: Digital Science Fiction Anthology
- Operative techniques in laparoscopic colorectal surgery
- Operator
- Operator "B"
- Operators and things
- Opere alese vol. II - Razboiul lumilor, Cand se va trezi Cel-care-doarme, Primii oameni in luna
- O perigo de estar lúcida
- O Peso do Passaro Morto
- Opfernacht
- Opgejaagd wild
- Ophelia after All
- Ophelia Scale
- Ophelia Scale - Die Welt wird brennen Ausgezeichnet mit dem Lovelybooks Leserpreis 2019: Deutsches Debüt
- Ophélie si vendica
- Ophie out of Oz
- Ophie's Ghosts
- Opio en las nubes
- O Pioneers!
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