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Balanced rating combines the average and the number of ratings; small samples carry less weight. How ranking works ↗

Space opera2019

Octavia Gone

Jack McDevitt

4.0(1)Open Library rating out of 5

Time travel1966

October the first is too late

Fred Hoyle

4.0(1)Open Library rating out of 5

Book1978

Odan the Half-God

Whetted Bronze

Manning Norvil

4.0(1)Open Library rating out of 5

Book1974

Odd Job #101, and Other Future Crimes and Intrigues

Ron Goulart

4.0(1)Open Library rating out of 5

Book2019

Odsburg

Matt Tompkins

4.0(1)Open Library rating out of 5

Space opera2002

Odyssey

Keith Laumer

4.0(1)Open Library rating out of 5

Robots & androids2003

Odyssey

Michael P. Kube-McDowell

4.0(1)Open Library rating out of 5

Book2001

Of darkness, light, and fire

Tanya Huff

4.0(1)Open Library rating out of 5

Of Jenny and the aliens

Ryan Gebhart

4.0(1)Open Library rating out of 5

Of the Fall

Paul J. McAuley

4.0(1)Open Library rating out of 5

Book1972

Of time and stars

the worlds of Arthur C. Clarke

Arthur C. Clarke

4.0(1)Open Library rating out of 5

Book1996

Off Limits

Tales of Alien Sex

Ellen Datlow; Robert Silverberg; Scott Bradfield; Sherry Coldsmith; Samuel R. Delany; Bessie Lee Jr.; Robert Silverberg

4.0(1)Open Library rating out of 5

Book2017

Off rock

Kieran Shea

4.0(1)Open Library rating out of 5

Book1994

Off the Wall at Callahan's

Spider Robinson

4.0(1)Open Library rating out of 5

Book2002

Off to See the Wizard

Nancy E. Krulik

4.0(1)Open Library rating out of 5

Book1998

Off-Line

Lawrence Goldstone

4.0(1)Open Library rating out of 5

Book1998

Officer-cadet (Dirigent Mercenary Corps)

Rick Shelley

4.0(1)Open Library rating out of 5

Book2014

Official Quiz Book

3,000 Questions from Across Space and Time

Jacqueline Rayner

4.0(1)Open Library rating out of 5

Time travel2014

Official Quotable Doctor Who

The Wit and Wisdom of Doctor Who

Cavan Scott; Mark Wright

4.0(1)Open Library rating out of 5

Book2004

Offspring

a novel of the Silent empire

Steven Harper

4.0(1)Open Library rating out of 5

Book2004

Oh My Goddess! Volume 18

Phantom Racer (Oh My Goddess)

Kosuke Fujishima

4.0(1)Open Library rating out of 5

Space opera2001

Old Guard: A Bolos Anthology

Book 5

Keith Laumer

4.0(1)Open Library rating out of 5

Book2018

Old Man Hawkeye

Ethan Sacks; Marco Checcetto

4.0(1)Open Library rating out of 5

Space opera2014

Old Man's War Boxed Set I

Old Man's War, the Ghost Brigades, the Last Colony

John Scalzi

4.0(1)Open Library rating out of 5