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• A History of Modern Sudan by Robert O. Collins Cambridge University Press Paperback 29 May 2008 from£23.35 | RRP: £16.99
• Revise Edexcel GCSE (9-1) Physics Foundation Revision Guide: (with free online edition) (REVISE Edexcel GCSE Science 11) by Mike O'Neill Pearson Education Paperback 2 May 2017 from£5.99 | RRP: £5.99
• Ireland Before the Famine 1798 - 1848 by Gearoid O Tuathaigh Gill & Macmillan Ltd Paperback 1 March 2007 from£13.99 | RRP: £11.99
• Still Standing: The Savage Years by Paul O'Grady Bantam Paperback 25 April 2013 from£9.09 | RRP: £7.99
• Stalins Falcons Resurgent: Soviet Air Power and the Battle of Kursk 1943 by Mark O'Neill Helion and Company Hardcover 19 December 2011 from£N/A | RRP: £25
• The Chisellers by Brendan O'Carroll O'Brien Press Ltd Paperback 28 November 2011 from£7.89 | RRP: £7.99
• The Book of General Knowledge Bombs: Amazing Facts, Oddities and Curiosities For Knowledge-Thirsty Minds (Unique Gift For Those Who Have Everything) by O'Neill, Bill LAK Publishing Paperback 28 October 2024 from£12.21 | RRP: £
• The Unofficial Sims Cookbook: From Baked Alaska to Silly Gummy Bear Pancakes, 85+ Recipes to Satisfy the Hunger Need (Unofficial Cookbook Gift Series) by O’Halloran, Taylor Adams Media Hardcover 10 November 2022 from£11.40 | RRP: £
• Poor: Grit, courage, and the life-changing value of self-belief by O'Sullivan, Katriona Sandycove Paperback 25 May 2023 from£20.23 | RRP: £
• A Season to Remember by Sheila O'Flanagan Headline Review Paperback 27 October 2011 from£8.89 | RRP: £7.99
• Ghost Light by Joseph O'Connor Vintage Paperback 3 March 2011 from£6.39 | RRP: £7.99
• The Complete Cortisol Detox Handbook: A Practical Guide & Workbook for Balancing Hormones, Regulating Emotions, Healing Your Gut, Reducing Inflammation and Managing Stress by O'Reilley, Sage The Emerald Society Paperback 30 March 2025 from£15.43 | RRP: £
• Green Grass of Wyoming (Flicka) by Mary O'Hara Mammoth Paperback 7 November 1991 from£6.73 | RRP: £4.99
• The Code: Silicon Valley and The Remaking of America (Chinese Edition) by Margaret O 'Mara CITIC Press Corporation Paperback 1 April 2022 from£98.04 | RRP: £
• The Distance Between Us by Maggie O'Farrell Headline Review Paperback 31 January 2005 from£8.99 | RRP: £7.99
• Critical Role: Vox Machina - Stories Untold by ,O'Brien, Liam Del Rey Hardcover 4 March 2025 from£29.70 | RRP: £
• The Devil Rides Out by Paul O'Grady Bantam Press Hardcover 16 September 2010 from£27.00 | RRP: £20
• The Essential Guide to User Interface Design: An Introduction to GUI Design Principles and Techniques by Wilbert O. Galitz John Wiley & Sons Paperback 17 April 2007 from£52.00 | RRP: £47.5
• Beyond District 12: the Stars of The Hunger Games (Hunger Games Film Tie in) by Mick O'Shea Plexus Publishing Ltd Paperback 13 March 2012 from£9.99 | RRP: £9.99
• The Aviation Book: The World's Aircraft A - Z by Fia O Caoimh Thames & Hudson Hardcover 30 October 2006 from£33.50 | RRP: £24.95
• Living the Dream by Daniel O'Donnell The O'Brien Press Hardcover 16 October 2017 from£14.39 | RRP: £17.99
• Thomas Jefferson Dreams of Sally Hemings by O'Connor, Stephen Penguin Books Paperback 2 May 2017 from£17.64 | RRP: £
• The Nine Years War, 1593-1603: O'Neill, Mountjoy and the Military Revolution by O'Neill, James Four Courts Press Ltd Hardcover 30 June 2017 from£40.00 | RRP: £
• Tickling the English by Dara O Briain Penguin Paperback 1 April 2010 from£7.89 | RRP: £7.99
• The Hand That First Held Mine by Maggie O'Farrell Headline Review Hardcover 29 April 2010 from£22.93 | RRP: £16.99