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• 2016: A New Proclamation for a New Generation by Gerard O'Neill The Mercier Press Ltd Hardcover 4 September 2010 from£16.87 | RRP: £12.99
• Century of Swansea (Century of Wales): Events, People and Places Over the 20th Century (Century of Wales) by John O'Sullivan The History Press Ltd Paperback 30 November 2007 from£14.99 | RRP: £9.99
• Adolescents and ADD: Gaining the Advantage by Patricia O. Quinn Magination Press Paperback 30 June 1995 from£10.73 | RRP: £11.5
• On a Rock in the Middle of the Ocean: Songs and Singers in Tory Island by Lillis O Laoire Clo Iar-Chonnachta Teo Hardcover 1 March 2007 from£34.72 | RRP: £
• Chief Secretary: Augustine Birrell in Ireland by Leon O Broin Chatto & Windus Hardcover 1 November 1969 from£136.56 | RRP: £2.1
• The Mental Health Act, 1983: A Guide for Social Workers by Larry O. Gostin Venture Press Paperback 1 December 1983 from£4.72 | RRP: £3.5
• Using Computers in Hospitality by Peter O'Connor Thomson Learning Paperback 29 April 2004 from£43.18 | RRP: £28.99
• A Journey Into Partial Differential Equations (International Series in Mathematics) by William O. Bray Jones and Bartlett Hardcover 25 February 2011 from£108.35 | RRP: £36.99
• Computational Analysis of Biochemical Systems: A Practical Guide for Biochemists and Molecular Biologists by Eberhard O. Voit Cambridge University Press Paperback 4 September 2000 from£68.85 | RRP: £42
• Multiparadigm Design for C++ by James O. Coplien Addison Wesley Paperback 13 October 1998 from£40.48 | RRP: £26.99
• Irish Is Fun-tastic by Sean O'Riain Y Lolfa Paperback 1 March 1990 from£5.33 | RRP: £3.95
• Dreams, Illusions and Other Realities by O'Flaherty Chicago University Press Paperback 1 February 1986 from£34.50 | RRP: £26
• A Bold Fresh Piece of Humanity (Random House Large Print) by Bill O'Reilly Random House Large Print Publishing Paperback 23 September 2008 from£25.62 | RRP: £26
• Britain and the Origins of the Vietnam War: UK Policy in Indo-China, 1943-50 (Global Conflict Since 1945) by T.O. Smith Palgrave Macmillan Hardcover 10 August 2007 from£39.99 | RRP: £52
• International Tribunals: Past and Future by Manley O. Hudson Kessinger Publishing Paperback 30 March 2007 from£25.54 | RRP: £18.25
• Market Microstructure Theory by Maureen O'Hara Wiley-Blackwell Hardcover 16 February 1995 from£61.43 | RRP: £84.99
• A Lucky Irish Lad by Kevin O'Hara Forge Hardcover 5 March 2010 from£24.28 | RRP: £17.99
• Sonata for Jukebox: Pop Music, Memory and the Imagined Life by Geoffrey O'Brien Counterpoint,U.S. Hardcover 25 February 2004 from£24.28 | RRP: £16.5
• Fandom and The Beatles: The Act You've Known for All These Years by ,O'Toole, Kit OUP USA Paperback 4 August 2021 from£29.99 | RRP: £
• Paterson and Zderad: Humanistic Nursing Theory (Notes on Nursing Theories) by Nancy O'Connor Sage Publications, Inc Paperback 15 January 1993 from£16.79 | RRP: £14.99
• Ancient Rome: City Planning and Administration by O. F. Robinson Routledge Paperback 1 September 1994 from£37.76 | RRP: £21.99
• Unlucky in Law by Perri O'Shaughnessy Piatkus Books Paperback 24 June 2005 from£9.43 | RRP: £6.99
• Te Manawa o Tuhoe: The Heart of Tuhoe by Terry O'Connor Craig Potton Publishing Paperback 31 August 2000 from£13.43 | RRP: £9.95
• Knick Knack Paddy Whack by Ardal O'Hanlon Henry Holt & Company Hardcover 1 February 2000 from£22.97 | RRP: £15.6
• The Moon and the Stars (Leisure Historical Romance) by Constance O'Banyon Dorchester Publishing Mass Market Paperback 30 September 2005 from£8.08 | RRP: £5.99