All authors, surname starts with O Books
Daniel O'Malley4
Eden O'Neill13
*Joyce Carol Oates200
*Patrick O'Brian44
*Anne O'Brien34
Jenny O'Brien18
*Kevin O'Brien23
Martin O'Brien12
*Carol O'Connell14
**Carlene O'Connor11
*Karen Odden4
Scott Oden8
*Tee O'Fallon9
*Maggie O'Farrell11
**Sheila O'Flanagan39
G J Ogden36
Kate O'Hearn21
*Kristina Ohlsson10
***Janette Oke106
Megan E O'Keefe9
*Nnedi Okorafor23
*Nick Oldham34
*Beth O'Leary4
*Caitlyn O'Leary43
*Lauren Oliver26
*Lisa Oliver82
SM Olivier7
Ollie Ollerton4
**Gregg Olsen60
Isla Olsen15
*Melissa F Olson20
*Tricia O'Malley38
Mike Omer9
*Barbara O'Neal13
Kenneth Oppel41
E Phillips Oppenheim151
*Bill O'Reilly35
*Diana Orgain34
*Emily Organ31
George Orwell67
K E Osborn63
*Bella Osborne27
*Erin Osborne57
**Mary Pope Osborne108
Kirsten Osbourne216
Alice Oseman11
Perri O'Shaughnessy15
*Mat Osman2
****Richard Osman3
*Aaron Oster31
***James Oswald17
Abigail Owen30
C M Owens49
*Delia Owens1
*Robin D Owens36
*Ruth Ozeki7

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