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• Roulette for the Millions by P O'Neil Dunne Sidg. & J Hardcover 1 October 1971 from£4.05 | RRP: £3.75
• Woe Is I JR.: The Younger Grammarphobe's Guide to Better English in Plain English by Patricia T. O'Conner Putnam Publishing Group Hardcover 10 May 2007 from£16.74 | RRP: £11.77
• Erich Przywara, S.J.: His Theology and His World by Thomas F. O'Meara University of Notre Dame Press Hardcover 31 March 2002 from£61.10 | RRP: £31.5
• Moses' Rock: A Play in Three Acts by Frank O'Connor,Hugh Hunt The Catholic University of America Press Paperback 31 December 1983 from£8.08 | RRP: £5.5
• Ultrasound in Paediatrics (Clinics in Diagnostic Ultrasound) by Jack O. Haller,A. Shkolnik Churchill Livingstone Hardcover 1 November 1981 from£9.38 | RRP: £6.95
• A Short History of Ireland by John O'Beirne Ranelagh Cambridge University Press Paperback 23 June 1983 from£18.83 | RRP: £13.95
• Searching for Christ: The Spirituality of Dorothy Day (1897-1980) (Notre Dame Studies in American Catholicism) by Brigid O'Shea Merriman University of Notre Dame Press Paperback 31 March 2001 from£16.88 | RRP: £15.5
• Grandpa Grumpy's Family by Katherine Pebley O'Neal ZonderKidz Hardcover 1 April 2008 from£12.79 | RRP: £8.99
• Cases in Comparative Politics by Patrick H. O'Neil W. W. Norton & Co. Paperback 6 October 2009 from£33.73 | RRP: £19.99
• Field Guide to Meteors and Meteorites (Patrick Moore's Practical Astronomy Series) by O. Richard Norton,Lawrence Chitwood Springer Paperback 28 April 2008 from£35.78 | RRP: £22
• Modelling Irish Railways by Stephen Johnson,Alan O'Rourke Midland Publishing Paperback 21 October 2004 from£6.78 | RRP: £14.99
• Beginning Partial Differential Equations: Solutions Manual by Peter V. O'Neil Wiley-Blackwell Paperback 20 March 2008 from£34.42 | RRP: £21.5
• Chicago in Photographs by Thomas J. O'Gorman Gramercy Books Hardcover 30 December 2005 from£15.75 | RRP: £11.08
• A Practical Guide to Child Nutrition 3rd Edition by Angela Dare,Margaret O'Donovan Nelson Thornes Paperback 25 June 2009 from£15.99 | RRP: £13.99
• Camus (Modern masters) by Conor Cruise O'Brien Fontana Paperback from£N/A | RRP: £
• Study Guide for Coon/Mitterer's Introduction to Psychology: Gateways to Mind and Behavior, 11th by Coon,Dennis Coon,John O. Mitterer Wadsworth Publishing Company Paperback 31 August 2006 from£118.70 | RRP: £36.69
• Understanding Catholicism (Complete Idiot's Guides (Lifestyle Paperback)) by Bob O'Gorman,Mary Faulkner Alpha Books Paperback 1 August 2003 from£18.92 | RRP: £12.85
• English Vocabulary in Use Advanced with CD-ROM: Vocabulary Reference and Practice by Michael McCarthy,Felicity O'Dell Cambridge University Press Paperback 19 December 2013 from£27.99 | RRP: £24.9
• Myth and Religion of the North: Religion of Ancient Scandinavia by Edward O.G. Turville-Petre Greenwood Press Hardcover 21 August 1975 from£108.00 | RRP: £87.95
• Journey Through Norway by Max Galli,Ernst O. Luthardt Art Stock Hardcover 1 June 2003 from£24.58 | RRP: £17.29
• Accent on Achievement: B-Flat Tenor Saxophone by John O'Reilly,Mark Williams Alfred Publishing Company Paperback 1 May 1997 from£10.65 | RRP: £5.39
• English for International Tourism: Pre-intermediate Class (English for Tourism) by M O'Keefe,Iwona Dubicka Longman Paperback 19 November 2002 from£29.28 | RRP: £20.8
• Carlingford (Irish Historic Towns Atlas) by Harold O'Sullivan,Raymond Gillespie Royal Irish Academy Paperback 20 May 2011 from£32.02 | RRP: £35.39
• Stuff: Compulsive Hoarding and the Meaning of Things by Randy O. Frost,Gail Steketee Houghton Mifflin Harcourt (HMH) Hardcover 20 April 2010 from£26.60 | RRP: £18.71
• Counter-reformation, 1550-1610 (Rise of Modern Europe) by Marvin R. O'Connell Joanna Cotler Books Hardcover 19 September 1974 from£10.12 | RRP: £7.5