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• Batman: Venom by Dennis O'Neil D C Comics (a division of Warner Brothers - A Time Warner Entertainment Co.) Paperback 1 October 1993 from£9.80 | RRP: £6.9
• Doctor Who - The Eleventh Hour: A Critical Celebration of the Matt Smith and Steven Moffat Era (Who Watching) by Andrew O'Day I.B.Tauris Hardcover 30 September 2013 from£120.00 | RRP: £58
• And Now We Have Everything: On Motherhood Before I Was Ready by O'Connell, Meaghan Little, Brown US Hardcover 14 June 2018 from£15.99 | RRP: £
• Growing Crystals (True Books: Earth Science) by Ann O. Squire Children's Press(CT) Paperback 1 September 2002 from£6.93 | RRP: £4.71
• Lough Derg and Its Pilgrimages: With Map and Illustrations by Daniel O'Connor BiblioBazaar, LLC Paperback 28 January 2009 from£N/A | RRP: £12.99
• Bande a Part: New York Underground 60s to 80s by Glen O'Brien Gingko Press, Inc Paperback 30 June 2007 from£33.75 | RRP: £32
• Falcon's Revenge by Joseph O'Steen Jada Press Paperback 17 September 2004 from£13.93 | RRP: £7.75
• Callaghan: A Life by Kenneth O. Morgan Oxford University Press Hardcover 25 September 1997 from£33.75 | RRP: £45
• On Another Man's Wound: A Personal History of Ireland's War of Independence by Ernie O'Malley Roberts Rinehart Publishers Paperback 28 December 2001 from£14.00 | RRP: £11.99
• Loitering with Intent: The Apprentice: Volume 2 by Peter O'Toole Macmillan Paperback 30 January 2014 from£14.99 | RRP: £14.99
• With Custer on the Little Bighorn: The First-and-Only Eyewitness Account Ever Written by William O Taylor Penguin Books Australia Paperback 28 August 1997 from£17.53 | RRP: £12.99
• Shiloh and The Western Campaign OF 1862 by O. Edward Cunningham Savas Beatie Hardcover 15 September 2007 from£33.75 | RRP: £25
• Irish Children and Teenagers in a Changing World: The National Write Here, Write Now Project by Pat O'Connor Manchester University Press Paperback 1 August 2008 from£15.94 | RRP: £14.99
• James Larkin (Radical Irish Lives) by Emmet O'Connor Cork University Press Paperback 18 September 2002 from£16.61 | RRP: £16.5
• My One and Only by Katherine O'Neal Bantam USA Mass Market Paperback 1 April 2000 from£64.24 | RRP: £4.99
• Pattern Classification: WITH Computer Manual, 2r.e. by Richard O. Duda WileyBlackwell Hardcover 24 May 2004 from£168.95 | RRP: £110
• Digging the Vein by Tony O'Neill Contemporary Press Paperback 9 February 2006 from£10.84 | RRP: £7.3
• Statistical Methods for Environmental Pollution Monitoring by Richard O. Gilbert John Wiley & Sons Hardcover 1 February 1987 from£69.34 | RRP: £120
• A Tao Te Ching: A New Approach Backward Down the Path by Jerry O. Dalton Humanics Ltd ,U.S. Paperback 18 January 1995 from£10.89 | RRP: £11.99
• Woofing it Down: The Quick & Easy Guide to Making Healthy Dog Food at Home by Patricia O'Grady AuthorHouse Paperback 5 June 2007 from£11.69 | RRP: £9.99
• Living Vatican II by Gerald O'Collins Paulist Press International,U.S. Paperback 1 May 2006 from£20.23 | RRP: £14.5
• The Irishness of Irish Music (Ashgate Popular and Folk Music Series) by John O'Flynn Ashgate Hardcover 28 March 2009 from£155.00 | RRP: £55
• Understand Electrical and Electronics Maths by O.N. Bishop Butterworth-Heinemann Ltd Paperback 15 February 1993 from£20.23 | RRP: £14.99
• A Walk Through Rebel Dublin, 1916 by Mick O'Farrell The Mercier Press Ltd Paperback 1 March 1999 from£6.53 | RRP: £11.5
• This Is the Life by Joseph O'Neill Faber and Faber Paperback 23 March 1992 from£6.73 | RRP: £4.99