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• Comparative Children's Literature by Emer O'Sullivan Routledge Hardcover 2 March 2005 from£115.58 | RRP: £65
• Scientific Computing with Case Studies by Dianne P. O'Leary Society for Industrial Mathematics Paperback 19 March 2009 from£60.88 | RRP: £60
• Descartes (Beginner's Guides) by Kevin O'Donnell Hodder Arnold Paperback 30 November 2001 from£5.99 | RRP: £5.99
• Court Culture in Dresden by Helen Watanabe-O'Kelly Palgrave Macmillan Hardcover 7 March 2002 from£40.29 | RRP: £60
• Finite Element Method in Engineering Science by O.C. Zienkiewicz McGraw-Hill Inc.,US Paperback 1 December 1972 from£10.12 | RRP: £8.95
• Japanese Names by P.G. O'Neill Weatherhill Inc Paperback 27 April 2005 from£33.71 | RRP: £22
• Honor, Symbols, and War by Barry O'Neill The University of Michigan Press Paperback 28 February 2001 from£25.95 | RRP: £26.95
• Postmortem: The murderous legacy of John Wayne Gacy by Lund O'Neil, Courtney Mirror Books Paperback 22 May 2025 from£9.43 | RRP: £
• Undoing Depression: What Therapy Doesn't Teach You and Medication Can't Give You by Richard O'Connor Souvenir Press Paperback 21 September 2007 from£20.23 | RRP: £14.99
• European Perceptions of Islam and America from Saladin to George W. Bush: Europe's Fragile Ego Uncovered by Peter O'Brien Palgrave Macmillan Hardcover 13 February 2009 from£39.99 | RRP: £42.5
• Night of Morningstar by Peter O'Donnell Souvenir Press Ltd Hardcover 21 October 1982 from£17.48 | RRP: £12.95
• Grenada: Revolution, Invasion and Aftermath by Hugh O'Shaughnessy H Hamilton Hardcover 1 April 1984 from£N/A | RRP: £12.95
• A Capital Offence: Plight of the Young Homeless in London by Brendan O'Mahoney Routledge Paperback 1 September 1988 from£4.38 | RRP: £3.25
• My Oedipus Complex by Frank O'Connor Penguin Paperback 1 January 1963 from£8.08 | RRP: £
• Undercover Protector (M&B Superromance) by Molly O'Keefe Harlequin, Mills & Boon Paperback 20 June 2008 from£4.98 | RRP: £3.69
• Annals of the Kingdom of Ireland by the Four Masters: Earliest Period to the Year 1616 v. 2 by John O'Donovan Kessinger Publishing Co Paperback 30 November 2007 from£36.82 | RRP: £28.95
• It's Okay to Miss the Bed on the First Jump and Other Life Lessons I Learned from Dogs by John O'Hurley Hodder Paperback Paperback 26 June 2008 from£N/A | RRP: £6.99
• In the Embrace of God: Feminist Approaches to Theological Anthropology by A.O'Hara Graff Orbis Books (USA) Paperback 1 August 1996 from£20.23 | RRP: £14.99
• Where Did Daddy's Hair Go? (Picture Book) by Joe O'Connor Random House Books for Young Readers Hardcover 25 April 2006 from£18.40 | RRP: £10.36
• Reimaging America: Arts of Social Change by Mark O'Brien,Craig Little New Society Publishers Paperback 29 November 1990 from£20.23 | RRP: £14.99
• Hundred Days (Aubrey-Maturin) by P O'Brian W. W. Norton & Co. Paperback 19 October 1999 from£10.98 | RRP: £9.99
• A Democracy at War: America's Fight at Home and Abroad in World War II by William O'Neill The Free Press Board book 2 December 1993 from£26.93 | RRP: £19.95
• Why Not? The Story of a Retail Maverick and Courts by Terry O'Connor OBE Marshall Cavendish International Asia Pte Ltd Paperback 16 October 2013 from£17.53 | RRP: £12.99
• The Poor Mouth by Flann O'Brien Grafton Paperback 24 April 1986 from£6.68 | RRP: £4.95
• Brendan Behan by Ulick O'Connor H Hamilton Hardcover 23 July 1970 from£85.59 | RRP: £2.5