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• What a Son Needs from His Dad: How a Man Prepares His Sons for Life by Michael O'Donnell Bethany House Publishers, a division of Baker Publishing Group Paperback 1 November 2011 from£11.81 | RRP: £6.99
• Assassins' Rage (Anne Cartier) by Charles O'Brien Severn House Publishers Ltd Hardcover 1 March 2008 from£12.82 | RRP: £18.99
• Education of a Poker Player by Herbert O Yardley Fontana Paperback 29 May 1980 from£1.68 | RRP: £1.25
• A Land Gone Lonesome: An Inland Voyage Along the Yukon River by Dan O'Neill Counterpoint,U.S. Hardcover 4 May 2006 from£24.58 | RRP: £16.99
• Weapons of Math Destruction: How Big Data Increases Inequality and Threatens Democracy by Cathy O'Neil Broadway Books Paperback 5 September 2017 from£12.43 | RRP: £11.24
• Labour in Power, 1945-51 by Kenneth O. Morgan Oxford University Press Hardcover 1 March 1984 from£33.75 | RRP: £25
• The Frankfurt Auschwitz Trial, 1963-1965: Genocide, History, and the Limits of the Law by Devin O. Pendas Cambridge University Press Hardcover 7 November 2005 from£114.00 | RRP: £47
• Empire, Welfare State, Europe: English History, 1906-92 (Short Oxford History of the Modern World) by T.O. Lloyd Oxford University Press Paperback 22 July 1993 from£24.28 | RRP: £17.99
• Norsk I Sammenheng, Custom Pub by O'leary McGraw Hill Higher Education Hardcover 1 January 1993 from£66.13 | RRP: £48.99
• Camera Close Up by O.R. Croy Focal Press Hardcover 1 December 1964 from£N/A | RRP: £3.95
• Joseph Banks: A Life by Patrick O'Brian David R Godine Pub Hardcover 1 March 1993 from£29.51 | RRP: £18.88
• Slavic Folklore: A Handbook : A Handbook (Greenwood Folklore Handbooks) by Natalie O. Kononenko Greenwood Press Hardcover 30 September 2007 from£31.95 | RRP: £31.95
• The Cows by Dawn O'Porter HarperCollins Paperback 5 April 2018 from£7.19 | RRP: £7.99
• Score Reading, Form and History Book 4 by Annie O. Warburton Cambridge University Press Paperback 1 January 1965 from£18.83 | RRP: £13.95
• Modesty Blaise by Peter O'Donnell Souvenir Press Ltd Paperback 27 April 1989 from£8.03 | RRP: £5.95
• Art & Life of Georgia O'Keeffe by O'Keeffe Crown Publications Hardcover 1 September 1993 from£47.25 | RRP: £35
• The Amazing Memory Kit: Everything You Need to Improve Your Memory! with Cards and Map by Dominic O'Brien Thunder Bay Press (CA) Paperback 10 October 2005 from£14.72 | RRP: £9.7
• The Culture of Curating and the Curating of Culture(s) (The MIT Press) by Paul O'Neill MIT Press Hardcover 10 August 2012 from£23.89 | RRP: £
• Cigarette Cards and How To Collect Them by I.O. Evans Read Books Paperback 1 January 2006 from£18.45 | RRP: £15.95
• Utterly Impartial History of Britain, An: (or 2000 Years of Upper Class Idiots in Charge) by John O'Farrell Doubleday Paperback 22 October 2007 from£16.18 | RRP: £11.99
• A History of Women in Ireland, 1500-1800 (Women And Men In History) by Mary O'Dowd Longman Paperback 22 November 2004 from£28.99 | RRP: £28.99
• Beside Yourself with Comfort: Hypnotic Help for Chronic or Acute Pain Relief by Bill O'Hanlon Crown House Publishing Ltd Audio CD 31 July 2009 from£18.88 | RRP: £13.99
• Back to the Front: An Accidental Historian Walks the Trenches of World War I by Stephen O'Shea Robson Books Ltd Paperback 25 October 1999 from£12.13 | RRP: £8.99
• The Power of Charismatic Healing: A Personal Account by Andy O'Neill The Mercier Press Ltd Paperback 1 October 1985 from£9.43 | RRP: £6.99
• Dining at Great American Lodges: Recipes Frim Legendary Lodges, National Park Lore, Landscape Art, Music by the Big Sky Ensemble by Sharon O'Connor Menus & Music Productions Paperback 1 September 2003 from£14.08 | RRP: £18.95