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• Trusted Criminals (Wadsworth Contemporary Issues in Crime and Justice) by David O. Friedrichs Wadsworth Publishing Co Inc Paperback 6 July 2006 from£164.21 | RRP: £51.99
• Girl With Green Eyes (Country Girls Trilogy 2) by Edna O'Brien Phoenix Paperback 5 September 2007 from£8.99 | RRP: £6.99
• Guns n' Roses Encyclopaedia, The by O'Shea,Mick Chrome Dreams Paperback 15 May 2008 from£12.99 | RRP: £12.99
• The Sleeping Beauties: And Other Stories of Mystery Illness by O'Sullivan, Suzanne Picador Paperback 31 March 2022 from£14.83 | RRP: £
• Social Policy and Social Work: An Introduction (Transforming Social Work Practice Series) by ,O'Sullivan, Alice Learning Matters Paperback 14 November 2025 from£26.99 | RRP: £
• The Third Policeman: Unabridged (Naxos Complete Classics) by Flann O'Brien Naxos AudioBooks Audio CD 26 February 2007 from£40.48 | RRP: £24.99
• The Locked Ward: Memoirs of a Psychiatric Orderly by Dennis O'Donnell Vintage Paperback 3 January 2013 from£9.89 | RRP: £8.99
• Soar with Your Strengths by Donald O. Clifton Bantam Doubleday Dell Publishing Group Paperback 31 January 1996 from£18.13 | RRP: £10.85
• The Crow: Special Edition by James O'Barr Titan Books ltd Paperback 26 July 2011 from£15.55 | RRP: £16.99
• ..I Only Wanted to Play Football by Eamonn O'Keefe Strategic Book Group Hardcover 28 April 2010 from£15.50 | RRP: £15.5
• My Friend Flicka: Part 1 (Dragon Books): Pt. 1 by Mary O'Hara Armada Paperback 15 December 1977 from£1.14 | RRP: £0.85
• The Crow by J. O'Barr Simon & Schuster Paperback 16 September 2002 from£12.04 | RRP: £8.92
• Cuentos Completos (O'Connor) / The Complete Stories by O'Connor, Flannery Debolsillo Mass Market Paperback 28 February 2007 from£15.99 | RRP: £
• Consilience by Edward O. Wilson Little, Brown & Company Paperback 3 September 1998 from£13.48 | RRP: £9.99
• 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: £
• Taken (Jo Birmingham 2) by Niamh O'Connor Transworld Ireland Paperback 26 April 2012 from£9.98 | RRP: £6.99
• GCSE ICT Coursework (GCSE Success Essentials) by Sean O'Byrne Letts Educational Paperback 1 January 2005 from£5.38 | RRP: £3.99
• Echoes of Memory by John O'Donohue Transworld Ireland Paperback 1 September 2011 from£7.89 | RRP: £7.99
• The Women Who Ran Away: And the secrets that followed them . . . by O'Flanagan, Sheila Headline Review Hardcover 16 July 2020 from£8.62 | RRP: £
• Lunch Poems (Pocket Poets) by Frank O'Hara City Lights Books Paperback 1 October 1986 from£6.99 | RRP: £7.99
• The Best of Myles: A Selection from 'Cruiskeen Lawn' by Flann O'Brien Flamingo Paperback 6 November 2009 from£10.78 | RRP: £7.99
• IN THE MIDNIGHT HOUR (Troubleshooters 1) by O'Shea Patti Tor Mass Market Paperback 10 October 2007 from£9.43 | RRP: £6.99
• The Sleeping Beauties: And Other Stories of Mystery Illness by O'Sullivan, Suzanne Picador Hardcover 1 April 2021 from£16.99 | RRP: £
• The Thrill of it All by Joseph O'Connor Harvill Secker Hardcover 15 May 2014 from£22.93 | RRP: £16.99
• Be Strong: You Are Braver Than You Think: A Child's Guide to Boosting Self-Confidence by O'Neill, Poppy Vie Paperback 10 September 2020 from£6.61 | RRP: £