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• The Night of Morningstar: Modesty Blaise by Peter O'Donnell Souvenir Press Ltd Paperback 20 September 2001 from£8.99 | RRP: £8.99
• Electrodynamics and Classical Theory of Fields and Particles by A.O. Barut Dover Publications Inc. Paperback 1 April 1981 from£11.98 | RRP: £9.99
• Fancy Nancy: Spectacular Spectacles (I Can Read Fancy Nancy - Level 1) by Jane O'Connor HarperCollins Paperback 22 June 2010 from£5.49 | RRP: £2.76
• Britain, Second Edition: Britain, Second Edition Student's Book: for Learners of English by James O'Driscoll OUP Oxford Paperback 2 April 2009 from£43.80 | RRP: £25
• Britain, Second Edition: Britain, Second Edition Pack (with Workbook) by James O'Driscoll OUP Oxford Paperback 30 April 2009 from£45.10 | RRP: £28
• I Blame the Scapegoats by John O'Farrell Doubleday Paperback 1 October 2003 from£14.83 | RRP: £10.99
• Truth to Life: The Art of Biography in the Nineteenth Century by Cockshut A. O. J. Harcourt Paperback 1 January 1974 from£N/A | RRP: £
• Plasma Dynamics (Oxford Science Publications) by R. O. Dendy Clarendon Press Paperback 20 September 1990 from£54.56 | RRP: £37.5
• Essentials of Comparative Politics by Patrick O'Neil W. W. Norton & Co. Paperback 19 September 2006 from£18.00 | RRP: £29.99
• In Search of Solutions: A New Direction in Psychotherapy (Norton Professional Books) by B O'Hanlon W. W. Norton & Co. Paperback 4 November 2003 from£19.99 | RRP: £14.99
• The Pocket Guide to English Language (Literacy in Context) by John O'Connor Cambridge University Press Paperback 19 December 2002 from£14.17 | RRP: £8.95
• Woman's Relationship with Herself (Women and Psychology) by Helen O'Grady Routledge Paperback 7 February 2005 from£43.44 | RRP: £14.95
• Master & Commander (Aubrey-Maturin) by P O'Brian W. W. Norton & Co. Hardcover 29 March 1995 from£28.33 | RRP: £17.99
• GAA Quiz Book: Over 2,000 Gaelic Football and Hurling Questions by Christy O'Connor Collins Paperback 1 October 2007 from£9.99 | RRP: £6.99
• Derek's Picks: The Best Quizzes of Derek O' Brien by Derek O'Brien Penguin Books Paperback 30 April 2008 from£6.75 | RRP: £9.99
• The Trouble With Advertising by John E. O'Toole Times Books Paperback 1 September 1985 from£8.81 | RRP: £5.78
• The Iceman Cometh (Jonathan Cape Paperback) by Eugene O'Neill Jonathan Cape Ltd Paperback 1 January 1966 from£10.78 | RRP: £7.99
• Schaum's Outline of Basic Circuit Analysis (Schaum's Outline Series) by John O'Malley Schaum's Outlines Paperback 1 July 1991 from£16.18 | RRP: £11.99
• The Humours of "Planxty" by Leagues O'Toole Hachette Books Ireland Paperback 7 June 2007 from£12.13 | RRP: £8.99
• Blood-Dark Track: A Family History by Joseph O'Neill Harper Perennial Paperback 30 April 2009 from£7.53 | RRP: £8.99
• Word Perfect: Dictionary of Current English Usage (Word series) by John O.E. Clark Chambers Hardcover 19 May 1987 from£12.08 | RRP: £8.95
• Cousin Coat: Selected Poems by Sean O'Brien Picador Paperback 11 October 2002 from£9.99 | RRP: £10.99
• Once and Forever by Constance O'Day-Flannery Avon Books Mass Market Paperback 1 November 1999 from£6.39 | RRP: £4.41
• Grenada: An Eyewitness Account of the U.S. Invasion and the Caribbean History That Provoked It by Hugh O'Shaughnessy Dodd Mead Hardcover 1 March 1985 from£2.92 | RRP: £1.93
• Dusty: The Definitive Biography by Lucy O'Brien Pan Books Paperback 10 March 2000 from£8.08 | RRP: £5.99