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• Consilience by Edward O. Wilson Little, Brown & Company Paperback 3 September 1998 from£13.48 | RRP: £9.99
• The Words We Use: v. 1 by Diarmaid O'Muirithe Four Courts Press Ltd Paperback 22 April 1996 from£9.38 | RRP: £6.95
• An Utterly Exasperated History of Modern Britain: or Sixty Years of Making the Same Stupid Mistakes as Always by John O'Farrell Random House Audiobooks Audio CD 22 October 2009 from£15.98 | RRP: £14.99
• The Growth Map: Economic Opportunity in the BRICs and Beyond by Jim O'Neill Portfolio Penguin Hardcover 1 December 2011 from£25.00 | RRP: £25
• Using Aspect Oriented Programming for Trustworthy Software Development by Vladimir O. Safonov Wiley-Blackwell Hardcover 6 June 2008 from£108.95 | RRP: £66.95
• Essex Boys, The New Generation by Bernard O'Mahoney Mainstream Publishing Paperback 4 June 2009 from£7.99 | RRP: £7.99
• How Will I Know? (Charnwood Large Print) by Sheila O'Flanagan Ulverscroft Large Print Books Ltd Hardcover 1 August 2006 from£31.03 | RRP: £20.99
• Haunted Places in England (1919) by Elliot O'Donnell Kessinger Publishing Co Paperback 1 August 2003 from£21.38 | RRP: £16.95
• Sons and Gunslicks by Chap O'Keefe Robert Hale Ltd Hardcover 30 March 2007 from£15.18 | RRP: £11.25
• As Easy as That by Mary O'Sullivan Poolbeg Press Hardcover 17 April 2007 from£9.43 | RRP: £6.99
• Trusted Criminals: White Collar Crime in Contemporary Society by David O. Friedrichs Wadsworth Publishing Company Paperback 26 June 2009 from£58.48 | RRP: £58.28
• The Vanishing Act of Esme Lennox by Maggie O'Farrell Headline Review Paperback 28 August 2006 from£61.15 | RRP: £11.99
• Sunken Treaties: Naval Arms Control Between the Wars by Emily O. Goldman Pennsylvania State University Press Paperback 1 January 1994 from£34.66 | RRP: £16.95
• Python: Create, Modify, Reuse by James O. Knowlton John Wiley & Sons Paperback 4 July 2008 from£36.43 | RRP: £26.99
• Batman: The Dark Knight (Movie Novelization) by Denny O'Neill Titan Books Ltd Paperback 21 July 2008 from£9.43 | RRP: £6.99
• Creative Photography by O.R. Croy Focal Press Hardcover 1 February 1966 from£N/A | RRP: £7.95
• Saints and Sinners by Edna O'Brien Faber & Faber Paperback 17 February 2011 from£17.53 | RRP: £12.99
• Empire, Welfare State, Europe: History of the United Kingdom 1906-2001 (Short Oxford History of the Modern World) by T. O. Lloyd OUP Oxford Paperback 2 May 2002 from£40.99 | RRP: £27
• Hiring Fairs and Farm Workers in North-West Ireland by Michael O'Hanlon Guildhall Press Hardcover 1 July 1992 from£3.37 | RRP: £2.5
• Hegel's Social Philosophy: The Project of Reconciliation (Modern European Philosophy) by Michael O. Hardimon Cambridge University Press Paperback 27 May 1994 from£29.75 | RRP: £29.99
• Dark Aemilia by Sally O'Reilly Myriad Editions Hardcover 27 March 2014 from£20.23 | RRP: £14.99
• Crannogs: Lake Dwellings in Early Ireland (Irish Treasures) by Aidan O'Sullivan Town House Paperback 20 April 2000 from£8.03 | RRP: £5.95
• Guns n' Roses Encyclopaedia, The by O'Shea,Mick Chrome Dreams Paperback 15 May 2008 from£12.99 | RRP: £12.99
• Exploration of the Universe by George O. Abell Holt,Rinehart & Winston of Canada Ltd Hardcover 1 June 1969 from£66.20 | RRP: £8.2
• Amazing Animal Journeys (DK Reader - Level 3 (Quality)) by Liam O'Donnell DK Publishing (Dorling Kindersley) Paperback 18 August 2008 from£4.98 | RRP: £2.71