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• The Fourth Man by K. O. Dahl Faber and Faber Paperback 1 March 2007 from£10.19 | RRP: £10.99
• Treasures of Islam: The Glories of Islamic Civilization by Bernard O' Kane Duncan Baird Publishers Hardcover 3 September 2007 from£33.75 | RRP: £25
• Journeys to the Interior: Ideas of England in Contemporary Poetry: Newcastle/Bloodaxe Poetry Lectures by Sean O'Brien Bloodaxe Books Ltd Paperback 28 June 2012 from£7.99 | RRP: £8.95
• Demystifying PANS/PANDAS: A Functional Medicine Desktop Reference on Basal Ganglia Encephalitis by O'Hara, Nancy DPWN Publishing Paperback 10 August 2022 from£20.99 | RRP: £
• Down Cobbled Streets: A Liberties Childhood by Phil O'Keefe Brandon / Mount Eagle Publications Ltd Paperback 4 October 1995 from£10.78 | RRP: £6.95
• The Diversity of Life (Penguin Science) by Edward O. Wilson Penguin Books Ltd Paperback 31 March 1994 from£12.13 | RRP: £8.99
• The Elephant's Secret Sense: The Hidden Life of the Wild Herds of Africa by Caitlin O'Connell Oneworld Publications Paperback 1 March 2009 from£9.89 | RRP: £9.99
• Pop Bakery Kit by Clare O'Connell CICO Books Hardcover 25 October 2012 from£11.29 | RRP: £12.99
• Locomotives of Sir Nigel Gresley by O.S. Nock Patrick Stephens Ltd Hardcover 16 December 1991 from£23.62 | RRP: £17.5
• After a Fashion: A History of the Irish Fashion Industry by Robert O'Byrne Town House Paperback 1 May 2000 from£25.63 | RRP: £18.99
• The Best Bar Trivia Book Ever: All You Need for Pub Quiz Domination by O’Neill, Michael Adams Media Corporation Paperback 31 October 2014 from£13.48 | RRP: £
• Consilience by Edward O. Wilson Little, Brown & Company Hardcover 17 September 1998 from£25.63 | RRP: £18.99
• Mark O'Connor: Contest Fiddling Championship Style [DVD] by Mark O'Connor Omnibus Press Paperback 1 October 2010 from£21.00 | RRP: £17.95
• One Hundred Flowers by Georgia O'Keeffe Phaidon Press Ltd Paperback 30 November 1990 from£8.08 | RRP: £5.95
• Advanced C++ Programming Styles and Idioms by James O. Coplien Addison Wesley Paperback 30 August 1991 from£41.04 | RRP: £48.99
• A Time to Every Purpose Under Heaven by Karl O. Knausgaard Portobello Books Ltd Hardcover 1 October 2008 from£25.63 | RRP: £18.99
• After You'd Gone by Maggie O'Farrell Headline Review Hardcover 6 April 2000 from£17.53 | RRP: £12.99
• The Black Widow: The Catherine Nevin Story by Niamh O'Connor O'Brien Press Ltd Paperback 18 July 2000 from£11.99 | RRP: £10.99
• Selected Poems Bernard O'Donoghue by Bernard O'Donoghue Faber and Faber Paperback 3 April 2008 from£12.89 | RRP: £12.99
• The Things They Carried by Tim O'Brien Mariner Books Paperback 13 October 2009 from£10.07 | RRP: £10.14
• Feline Fatale (Kendra Ballantine, Pet-Sitte) by Linda O. Johnston Berkley Paperback 6 July 2010 from£7.87 | RRP: £5.42
• Blake and Bourke: And the End of Empires by Kevin O'Connor Prendeville Publishing Hardcover 1 April 2003 from£16.20 | RRP: £12
• A Short History of Brexit: From Brentry to Backstop (Pelican Books) by O'Rourke, Kevin Pelican Hardcover 31 January 2019 from£20.00 | RRP: £
• Illustrated Sourcebook of Mechanical Components by Robert O. Parmley McGraw-Hill Professional Hardcover 1 May 2000 from£63.00 | RRP: £70
• That Lady by Kate O'Brien Virago Press Ltd Paperback 6 July 2006 from£12.00 | RRP: £12