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Oath of FealtyLarry Niven
Jerry Pournelle
Oath of GoldElizabeth Moon
N/A
Oath of SwordsDavid Weber
Oath of Swords and Sword BrotherDavid Weber
An Oblique ApproachDavid Drake
Eric Flint
OdysseyKeith Laumer
Eric Flint
Of Berserkers, Swords & VampiresFred Saberhagen
Of War and HonorGordon R. Dickson
Old NathanDavid Drake
Old SoldiersDavid Weber
On Basilisk StationDavid Weber
On Basilisk Station (Leatherbound edition)David Weber
Once a HeroElizabeth Moon
One Day on MarsTravis S. Taylor
One Foot in the GraveWilliam Mark Simmons
One Good SoldierTravis S. Taylor
One Jump AheadMark L. Van Name
Operation DamoclesOscar L. Fellows
N/A
The Orc WarsJohn Dalmas
Original Edition of edited Godwin StoriesTom Godwin
Eric Flint
Original Edition of edited Schmitz StoriesJames H. Schmitz
Orphans of the SkyRobert A. Heinlein
N/A
Other Times Than PeaceDavid Drake
The Other WorldMercedes Lackey
Mark Shepherd
Holly Lisle
OverkillRobert Buettner
Overthrowing HeavenMark L. Van Name
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