Books about Science fiction (sorted alphabetically)
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Operation Boomerang
George Revelle
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Operation Distress
Lester Del Rey
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Operation Earthworm
Joe Archibald
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Operation Interstellar
George O. Smith
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Operation Lorelie
William P. Salton
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Operation: Outer Space
Murray Leinster
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Operation R.S.V.P.
H. Beam Piper
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Operation Terror
Murray Leinster
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Or Darwin, if you prefer
Mel Hunter
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Ordeal in Space
Ralph Sloan
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Ordeal of Colonel Johns
George H. Smith
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ordeal of Lancelot Biggs
Nelson S. Bond
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Oridin's Formula
R. R. Winterbotham
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Orphans of the Void
Michael Shaara
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Or Your Money Back
Randall Garrett
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Other Likeness
James H. Schmitz
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Other Now
Murray Leinster
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Ounce of Cure
Alan Edward Nourse
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Our Town
Jerome Bixby
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Out Around Rigel
Robert H. Wilson
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Outbreak of Peace
H. B. Fyfe
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Outcast of the Stars
Robert Silverberg
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Outcasts of Solar III
Robert Emmett McDowell
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Outer Quiet
Herbert D. Kastle
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Out Like a Light
Randall Garrett and Laurence M. Janifer