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• The Ultimate Quiz Challenge by Derek O'Brien Penguin Books Paperback 1 October 2005 from£13.48 | RRP: £6.99
• Post Captain (Aubrey-Maturin) by PATRICK O'BRIAN W. W. Norton & Co. Paperback 14 November 1991 from£12.21 | RRP: £9.99
• The Best a Man Can Get by John O'Farrell Black Swan Paperback 4 June 2001 from£9.99 | RRP: £7.99
• It's Ok to Miss the Bed on the First Jump: And Other Life Lessons I Learned from Dogs by John O'Hurley Hodder & Stoughton Hardcover 15 November 2007 from£13.48 | RRP: £16.99
• An Utterly Impartial History of Britain or 2000 Years of Upper-class Idiots in Charge by John O'Farrell Doubleday Hardcover 22 October 2007 from£22.93 | RRP: £16.99
• Racial Matters: The FBI's Secret File on Black America, 1960-1972 by Kenneth O'Reilly The Free Press Paperback 1 April 1991 from£17.75 | RRP: £7.5
• Mauritius Command (Aubrey-Maturin) by Patrick O'Brian W. W. Norton & Co. Paperback 18 June 1992 from£13.29 | RRP: £9.99
• Undoing Depression: What Therapy Doesn't Teach You and Medication Can't Give You by Richard O'Connor Souvenir Press Ltd Paperback 21 January 2010 from£16.99 | RRP: £14.99
• How to Study Romantic Poetry (How to Study Literature) by Paul O'Flinn Palgrave Macmillan Paperback 12 July 1988 from£13.48 | RRP: £9.99
• Winx Club Magical Magix [With Sparkly Patterns] by Ellie O'Ryan Scholastic Paperback 1 August 2005 from£4.91 | RRP: £3.31
• The Brain: A Very Short Introduction (Very Short Introductions) by Michael O'Shea OUP Oxford Paperback 8 December 2005 from£6.39 | RRP: £7.99
• A Girl Thing by Sarah O'Brien Hachette Books Ireland Paperback 14 August 2006 from£9.43 | RRP: £6.99
• The Reverse of the Medal by Patrick O'Brian HarperCollins Audio Cassette 15 February 1999 from£14.83 | RRP: £10.99
• Not Untrue and Not Unkind by Ed O'Loughlin Penguin Paperback 1 April 2010 from£11.99 | RRP: £8.99
• Beyond Belief: Abused by His Priest, Betrayed by His Church - The Story of the Boy Who Sued the Pope by Colm O'Gorman Hodder Paperbacks Paperback 1 April 2010 from£11.52 | RRP: £6.99
• The Hounds of the Morrigan by Pat O'Shea HarperTrophy Mass Market Paperback 1 June 1999 from£8.85 | RRP: £6.23
• Z For Zachariah (Puffin Teenage Fiction) by Robert O'Brien Puffin Paperback 26 February 1998 from£6.99 | RRP: £5.99
• Lost Soul?: The Catholic Church Today by D.J. O'Leary Columba Press Paperback 1 May 1999 from£13.48 | RRP: £11.5
• No Reservations by Fiona O'Brien Hodder Paperbacks Paperback 18 February 2010 from£10.45 | RRP: £6.99
• Appointment in Samarra (Vintage Classics) by John O'Hara Vintage Classics Paperback 3 April 2008 from£7.99 | RRP: £7.99
• Green IT for Sustainable Business Practice: An ISEB Foundation Guide by Mark G. O'Neill British Computer Society Paperback 28 April 2010 from£24.85 | RRP: £24.95
• Sabre Tooth (Modesty Blaise) by Peter O'Donnell Souvenir Press Ltd Paperback 14 August 2003 from£10.41 | RRP: £8.99
• Confessions of a Fallen Angel by Ronan O'Brien Sceptre Paperback 16 October 2008 from£9.43 | RRP: £6.99
• I Could Read the Sky by Timothy E. O'Grady The Harvill Press Hardcover 2 October 1997 from£40.50 | RRP: £30
• Test Engineering: A Concise Guide to Cost-effective Design, Development and Manufacture (Quality and Reliability Engineering Series) by Patrick O'Connor Wiley-Blackwell Hardcover 26 April 2001 from£74.80 | RRP: £56.5