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• Newnes Engineering Science (Pocket Book) by J. O. Bird Crc Pr I Llc Hardcover 1 June 1987 from£19.65 | RRP: £13.24
• Winter House by Carol O'Connell Arrow Books Ltd Paperback 16 November 2006 from£10.78 | RRP: £6.99
• Berkeley (Past Masters) by J.O. Urmson Oxford Paperbacks Paperback 18 March 1982 from£6.73 | RRP: £4.99
• Art Beyond the West: The Arts of Africa, India and Southeast Asia, China, Japan and Korea, the Pacific and the Americas by Michael Kampen O'Riley Laurence King Publishing Paperback 17 September 2001 from£26.93 | RRP: £19.95
• Kade: Original Sun by Sean Patrick O'Reilly Arcana Studio Paperback 29 May 2010 from£14.83 | RRP: £10.99
• Christmas Wishes (Care Bears 8x8) by Ellie O'Ryan Scholastic Paperback 1 October 2006 from£3.53 | RRP: £2.43
• The Far Side of the World by Patrick O'Brian Fontana Press Paperback 12 December 1985 from£8.08 | RRP: £5.99
• If I Die in A Combat Zone by Tim O'Brien Imprint unknown Paperback 1 January 2006 from£61.52 | RRP: £7.99
• Fancy Nancy by Jane O'Connor HarperCollins Publishers Hardcover 1 December 2005 from£12.03 | RRP: £12.2
• Focus on Advanced English: C.A.E by Sue O'Connell Nelson ELT Paperback 1 March 1992 from£18.49 | RRP: £13.7
• Beyond Breathless (Harlequin Blaze) by Kathleen O'Reilly Harlequin Books Mass Market Paperback 1 January 2007 from£5.99 | RRP: £3.08
• The Salesman by Joseph O'Connor Vintage Paperback 5 December 1998 from£9.99 | RRP: £7.99
• Stoics and Neostoics: Rubens and the Circle of Lipsius by Mark P.O. Morford Princeton University Press Hardcover 1 July 1992 from£64.80 | RRP: £33
• Trawler: A Journey Through the North Atlantic by Redmond O'Hanlon Penguin Paperback 3 June 2004 from£9.99 | RRP: £9.99
• Ancestral Voices: Religion and Nationalism in Ireland by Conor Cruise O'Brien Poolbeg Press Ltd Hardcover 22 September 1994 from£10.78 | RRP: £7.99
• Object-Oriented Analysis and Design: Understanding System Development with UML 2.0 by Mike O'Docherty John Wiley & Sons Paperback 8 April 2005 from£45.57 | RRP: £34.99
• An Utterly Exasperated History of Modern Britain: or Sixty Years of Making the Same Stupid Mistakes as Always by John O'Farrell Doubleday Hardcover 22 October 2009 from£25.63 | RRP: £18.99
• Night's Cold Kiss: A Dark Brethren Novel by Tracey O'Hara Eos Mass Market Paperback 1 September 2009 from£9.11 | RRP: £5.54
• The Missing by Andrew O'Hagan Picador Paperback 13 September 1996 from£8.08 | RRP: £6.99
• Something Borrowed, Something Blue by Joan O'Neill Hodder & Stoughton Ltd Hardcover 2 November 2000 from£24.28 | RRP: £17.99
• The Talk of the Town by Ardal O'Hanlon Sceptre Paperback 7 May 1998 from£13.50 | RRP: £10
• Clarissa Oakes by Patrick O'Brian Harper Perennial Paperback 2 June 2008 from£10.78 | RRP: £7.99
• Collected Stories of John O'Hara: Selected and With an Introduction by Frank Macshane by John O'Hara Random House Inc (T) Hardcover 1 February 1985 from£19.65 | RRP: £12.94
• War and Power: Who Wins Wars ? and Why by O'Brien, Phillips Payson Viking Hardcover 28 August 2025 from£17.61 | RRP: £
• Che (Ensayo) by Pacho O'Donnell Debolsillo Paperback 5 April 2005 from£10.63 | RRP: £7.43