All authors, surname starts with O Books
Daniel O'Malley4
Eden O'Neill13
Colleen Oakley5
Joyce Carol Oates200
Patrick O'Brian44
Anne O'Brien34
Jenny O'Brien18
Kevin O'Brien23
Carol O'Connell14
Carlene O'Connor11
Karen Odden4
Scott Oden8
Mel Odom159
Tee O'Fallon9
Maggie O'Farrell11
Chris Offutt8
Sheila O'Flanagan38
Max O'Hara3
Kate O'Hearn21
Kristina Ohlsson10
Janette Oke106
Megan E O'Keefe9
Nnedi Okorafor23
Nick Oldham34
Beth O'Leary4
Caitlyn O'Leary42
Susanne O'Leary44
Lauren Oliver26
Lisa Oliver81
Gregg Olsen60
Melissa F Olson20
Tricia O'Malley38
Mike Omer9
Barbara O'Neal13
Kenneth Oppel40
E Phillips Oppenheim151
Baroness Orczy50
Bill O'Reilly35
Diana Orgain33
Emily Organ31
George Orwell67
Alexey Osadchuk13
K E Osborn61
Bella Osborne26
Erin Osborne56
Mary Pope Osborne108
Kirsten Osbourne217
Alice Oseman11
Perri O'Shaughnessy15
Mat Osman2
Richard Osman3
Aaron Oster31
James Oswald17
Abigail Owen31
C M Owens49
Delia Owens1
Robin D Owens36
Ruth Ozeki7

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