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• Names and Faces (Never Forget) by Dominic O'Brien Duncan Baird Publishers Paperback 15 August 2002 from£3.37 | RRP: £2.5
• Home to Derry by Tomas O Canainn Appletree Press Ltd Hardcover 23 November 2004 from£12.13 | RRP: £8.99
• The Quiet Heart, by the Author of 'Katie Stewart'. . by Margaret O Oliphant Unknown Paperback 17 August 2009 from£N/A | RRP: £18.64
• Watch Them Die by Kevin O'Brien Pinnacle Books,U.S. Paperback 6 January 2009 from£5.38 | RRP: £4.99
• Connections by Sheila O'Flanagan Hachette Books Ireland Paperback 1 February 2006 from£14.83 | RRP: £10.99
• Trusted Criminals: White Collar Crime in Contemporary Society by David O. Friedrichs Wadsworth Publishing Co Inc Paperback 4 September 2003 from£52.63 | RRP: £40.99
• Cristiano Ronaldo (Artnik Football) by Michael O'Connell Artnik Paperback 15 May 2006 from£N/A | RRP: £8.99
• Europe in the 20th Century by Robert O. Paxton Thomson Learning Hardcover 13 July 2001 from£43.20 | RRP: £32
• The Great Dragon Bake Off by ,O'Byrne, Nicola Bloomsbury Children's Books Hardcover 14 July 2016 from£16.18 | RRP: £
• The Great Satan Vs. the Mad Mullahs: How the United States and Iran Demonize Each Other by William O. Beeman Greenwood Press Hardcover 1 May 2005 from£29.56 | RRP: £27.95
• W.Robertson Smith and the Sociological Study of Religion by T.O. Beidelman University of Chicago Press Hardcover 1 December 1974 from£7.42 | RRP: £6.3
• Ireland, India and Empire: Indo-Irish Radical Connections, 1919-64 (Studies in Imperialism) by Kate O' Malley Manchester University Press Hardcover 1 March 2008 from£70.99 | RRP: £50
• HVAC Design Data Sourcebook by Robert O. Parmley McGraw-Hill Publishing Co. Hardcover 1 June 1994 from£41.83 | RRP: £30.99
• Torchwood: Among Us Part 3 by ,O'Mahony, David Big Finish Productions Ltd Audio CD 30 September 2023 from£28.66 | RRP: £
• The Question: Peacemaker by Dennis O'Neil Titan Books Ltd Paperback 25 June 2010 from£16.49 | RRP: £13.99
• Melling O.R. : Magic Maker by O R Melling Penguin Books Ltd Paperback 22 February 1990 from£7.83 | RRP: £5.01
• Party Animals by Olivia O'Leary O'Brien Press Ltd Paperback 27 October 2006 from£14.83 | RRP: £9.99
• Redemption Falls by Joseph O'Connor Free Press Paperback 10 June 2008 from£22.50 | RRP: £9.49
• Belfast City Hospital: A Photographic History by John O'Sullivan Cottage Publications Hardcover 29 September 2003 from£8.99 | RRP: £8.99
• Joseph Conrad Today (Societas) by Kieron O'Hara Imprint Academic Paperback 1 November 2007 from£9.49 | RRP: £8.95
• Political Astrology by Michael O'Reilly Wingspan Press Paperback 31 July 2005 from£19.61 | RRP: £12.17
• When it Feels so Right (Kimani Romance) by Celeste O. Norfleet KIMANI PRESS Mass Market Paperback 16 October 2009 from£6.73 | RRP: £4.99
• Annals of the Kingdom of Ireland, by the Four Masters, from the Earliest Period to the Year 1616 by John O'Donovan BiblioBazaar, LLC Paperback 20 August 2009 from£18.74 | RRP: £19.99
• Scottish Gaelic in Three Months (Hugo's Three Month Language Series) by Roibeard O. Maolalaigh Hunter Publishing (NJ) Paperback 1 December 1997 from£6.68 | RRP: £
• Jacquot and the Angel by Martin O'Brien Headline Book Publishing Paperback 26 September 2005 from£11.48 | RRP: £10.99