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• Our Fathers by Andrew O'Hagan Faber and Faber Paperback 6 May 2004 from£9.44 | RRP: £7.99
• Uncommon Valour: 1916 and the Battle for the South Dublin Union by Paul O'Brien The Mercier Press Ltd Paperback 1 February 2010 from£11.47 | RRP: £11.5
• Mock the Week by Dara O Briain Sound Entertainment Limited Audio CD 3 December 2007 from£N/A | RRP: £9.99
• A Bold Fresh Piece of Humanity by Bill O'Reilly Broadway Books Paperback 4 May 2010 from£15.48 | RRP: £11.08
• The Manchester Martyrs by Joseph O'Neill The Mercier Press Ltd Paperback 1 March 2012 from£16.99 | RRP: £12.99
• Anything is Possible if You Think About It Hard Enough (NHB Modern Plays) by Cordelia O'Neill Nick Hern Books Paperback 23 September 2021 from£12.10 | RRP: £
• Modesty Blaise - The Young Mistress (Modesty Blaise (Graphic Novels)) by Peter O'Donnell Titan Books Paperback 30 May 2014 from£11.29 | RRP: £11.99
• Music, Magic & Madness: Adventures Recording Music Legends by O'Duffy, Alan Independently published Paperback 15 July 2024 from£N/A | RRP: £
• ABC of Architecture by James O'Gorman University of Pennsylvania Press Paperback 1 October 1997 from£18.99 | RRP: £11.5
• Jedward Our Story by Jennifer O'Brien John Blake Publishing Paperback 24 October 2010 from£17.53 | RRP: £12.99
• In the Forest by Edna O'Brien Phoenix Paperback 6 March 2003 from£8.99 | RRP: £7.99
• The Deregulated Muse: Essays on Contemporary British and Irish Poetry by Sean O'Brien Bloodaxe Books Ltd Paperback 1 August 1997 from£14.78 | RRP: £10.95
• A Vanishing World - The Irish Country House Photographs of Father Browne by Robert O'Byrne Messenger Publications Paperback 4 October 2024 from£17.59 | RRP: £
• I Wonder Why Snakes Shed Their Skin: And Other Questions about Reptiles by Amanda O'Neill Kingfisher Paperback 25 April 2003 from£6.97 | RRP: £4.74
• Nine Years War-1593 to 1603 Volume 1: The Ascendancy of Irish Arms and the Road to Yellow Ford, 1593-1598: 29 (From Retinue to Regiment) by O'Neil, James Helion & Company Paperback 23 January 2025 from£20.94 | RRP: £
• Selfhood and Sacrifice: Rene Girard and Charles Taylor on the Crisis of Modernity by Andrew O'Shea Continnuum-3PL Paperback 19 January 2012 from£38.99 | RRP: £19.99
• Shaken and Stirred (Mills & Boon Blaze) (Blaze Romance) by Kathleen O' Reilly Harlequin, Mills & Boon Paperback 17 July 2009 from£4.30 | RRP: £3.19
• Running: The Autobiography by Ronnie O'Sullivan Orion Paperback 10 April 2014 from£8.89 | RRP: £7.99
• The Complete Novels (Everyman Library) by Flann O'Brien Everyman's Library Hardcover 21 September 2007 from£11.89 | RRP: £14.99
• Things We Never Say by Sheila O'Flanagan Headline Review Paperback 24 April 2014 from£8.49 | RRP: £8.99
• Pakistan: Eye of the Storm by O Bennett Jones Yale University Press Paperback 11 September 2009 from£12.99 | RRP: £12.99
• The Crow: Special Edition by James O'Barr Titan Books ltd Paperback 26 July 2011 from£15.55 | RRP: £16.99
• The Official Guide to Body Massage (Habia City & Guilds) by Adele O'Keefe Thomson Learning Vocational Paperback 5 April 2006 from£41.40 | RRP: £27.99
• The Locked Ward: Memoirs of a Psychiatric Orderly by Dennis O'Donnell Vintage Paperback 3 January 2013 from£9.89 | RRP: £8.99
• Kings of the Saddle: Ireland's Greatest Jockeys by Brian O'Connor Aurum Press Ltd Hardcover 25 September 2009 from£25.63 | RRP: £18.99