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• Robot Brains: Circuits and Systems for Conscious Machines by Pentti O. Haikonen Wiley-Blackwell Hardcover 21 September 2007 from£136.01 | RRP: £72.95
• After the Ball: Ireland After the Boom by Fintan O'Toole New Island Books Hardcover 1 October 2003 from£10.78 | RRP: £7.99
• Voices from Heaven: Communion with Another World by Stephen O'Brien Voices Paperback 1 July 2001 from£10.78 | RRP: £7.99
• Rough Guide Directions Cancun and Cozumel by Zora O'Neill Rough Guides Ltd Paperback 26 May 2005 from£9.43 | RRP: £6.99
• Regional History of the Railways of Great Britain: The North West v. 10 (A regional history of the railways of Gret Britain) by Geoffrey O. Holt David & Charles Hardcover 27 July 1978 from£10.12 | RRP: £7.5
• Visions of Another World: The Autobiography of a Medium by Stephen O'Brien Voices Paperback 1 July 2000 from£10.78 | RRP: £7.99
• How to Grow Up When You're a Grown-up: Achieving Balance in Adulthood by Nancy O'Connor Sigo Press,U.S. Paperback 1 May 1995 from£16.18 | RRP: £11.99
• Heidegger's Concept of Truth (Modern European Philosophy) by Daniel O. Dahlstrom Cambridge University Press Paperback 19 March 2009 from£40.99 | RRP: £29.99
• The Resurrectionist by Jack O'Connell Algonquin Books of Chapel Hill Hardcover 8 April 2008 from£25.25 | RRP: £17.29
• Outliving by Bernard O'Donoghue Chatto & Windus Paperback 3 April 2003 from£9.51 | RRP: £8.99
• To Marry a British Lord by Judith O'Brien Pocket Books Paperback 1 October 1997 from£5.89 | RRP: £3.89
• Medicine's Strangest Cases by Michael O'Donnell Portico Paperback 2 November 2009 from£6.99 | RRP: £6.99
• Craic Baby: Dispatches from a Rising Language by O'Séaghdha, Darach Apollo Hardcover 6 September 2018 from£6.54 | RRP: £
• The Perl CD Bookshelf by Inc. O'Reilly Media O'Reilly Media Paperback 1 August 1999 from£64.59 | RRP: £49.93
• Barron's AP United States History Barron's AP United States History by William O. Kellogg Barron's Educational Series Paperback 1 January 2008 from£16.74 | RRP: £11.52
• The Light-Bearer's Daughter (Chronicles of Faerie) by O. R. Melling HNA Books Hardcover 1 May 2007 from£21.41 | RRP: £11.49
• Cadmium in the Environment: Health Effects Pt. 2 (Environmental Science and Technology Series) by Jerome O. Nriagu John Wiley & Sons Inc Hardcover 1 December 1981 from£182.25 | RRP: £135
• The Nine Years War 1593-1603 Part 2: The Turning Point at Kinsale 1598-1603 (From Retinue to Regiment 1453-1618) by O'Neill, James Helion & Company Paperback 15 June 2025 from£24.94 | RRP: £
• Learning Irish: An Introductory Self-tutor by Micheal O Siadhail Yale University Press Paperback 1 July 1988 from£20.18 | RRP: £14.95
• The ECG Criteria Book by James O'Keefe Jones and Bartlett Publishers, Inc Paperback 10 December 2009 from£28.11 | RRP: £15.99
• Theology of Ministry (Theological Inquiries) by Thomas O'Meara Paulist Press International,U.S. Paperback 1 January 2000 from£22.93 | RRP: £15.99
• General Election of 1880 (Oxford Historical Monographs) by T.O. Lloyd Oxford University Press Hardcover 1 February 1968 from£N/A | RRP: £2.5
• Transitional Justice, Judicial Accountability and the Rule of Law by Hakeem O. Yusuf Routledge Hardcover 28 April 2010 from£143.49 | RRP: £75
• Bondage of the Will, The by ,Johnston, O. R. Baker Academic Paperback 1 July 2012 from£11.48 | RRP: £
• Cadmium in the Environment: Ecological Cycling Pt. 1 (Environmental Science and Technology Series) by Jerome O. Nriagu John Wiley & Sons Inc Hardcover 2 July 1980 from£36.61 | RRP: £131.45