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• Ireland and the Fiction of Improvement by Helen O'Connell OUP Oxford Hardcover 21 September 2006 from£13.55 | RRP: £68
• Mills by Manning O'Brine Barrie & Jenkins Hardcover 1 January 1969 from£N/A | RRP: £1.25
• James Joyce (Lives) by Edna O'Brien Weidenfeld & Nicolson Paperback 20 May 1999 from£17.53 | RRP: £12.99
• "The Village of Longing by George O'Brien Penguin Books Ltd Paperback 7 June 1990 from£8.08 | RRP: £5.99
• Medway's Mini Dictionary of English Idioms by John O E Clark Medway Publishing Ltd Paperback 11 August 2004 from£4.03 | RRP: £2.99
• Texas Wedding (Harlequin Super Romance) by Kathleen O'Brien Harlequin Mass Market Paperback 14 July 2009 from£6.95 | RRP: £3.73
• Make Us Traitors by Gilda O'Neill William Heinemann Ltd Hardcover 5 February 2004 from£25.63 | RRP: £18.99
• Dusty by Lucy O'Brien Sidgwick & Jackson Ltd Paperback 12 March 1999 from£13.48 | RRP: £9.99
• Nuclear Age by Tim O'Brien Penguin Books Ltd Paperback 5 December 1996 from£10.80 | RRP: £12.99
• Chihuahuas for Dummies by Jacqueline O'Neil John Wiley & Sons Paperback 30 November 2007 from£10.59 | RRP: £11.99
• Music and Medicine: Medical Profiles of Great Composers by John O'Shea Dent Paperback 28 April 1994 from£22.68 | RRP: £29
• Bottersnikes and Other Lost Things: A Treasury of Australian Children's Literature by Juliet O'Conor Melbourne University Press Hardcover 1 October 2009 from£38.61 | RRP: £53.5
• Legends by Terry O'Neill Jonathan Cape Ltd Hardcover 26 September 1985 from£16.87 | RRP: £12.5
• Shipwrecked Heritage: A Commentary on the UNESCO Convention on Underwater Cultural Heritage by Patrick .J. O'Keefe Institute of Art & Law Paperback 1 September 2002 from£36.45 | RRP: £27
• Father William Doyle (1922) by Alfred O'Rahilly Kessinger Publishing Paperback 30 November 2007 from£30.99 | RRP: £23.2
• Head of the Civil Service: Biography of Sir Warren Fisher by Eunan O'Halpin Routledge Hardcover 6 July 1989 from£17.53 | RRP: £12.99
• Island of the Blue Dolphins by Scott O'Dell Houghton Mifflin (Trade) Hardcover 1 December 1995 from£11.74 | RRP: £8.25
• The Hawk That Dare Not Hunt by Day by Scott O'Dell Houghton Mifflin (T) Hardcover 1 September 1975 from£7.83 | RRP: £5.51
• Graham Greene (Reader's Guides) by Paul O'Prey Thames & Hudson Ltd Hardcover 20 June 1988 from£10.95 | RRP: £10.95
• A Faith You Can Live with: Understanding the Basics (Come & see) by John J. O'Donnell Sheed & Ward,U.S. Paperback 1 October 1999 from£25.99 | RRP: £13.95
• Daughters of Passion by Julia O'Faolain Penguin Books Ltd Paperback 28 October 1982 from£2.63 | RRP: £1.95
• Mallory's Oracle by Carol O'Connell Arrow Books Ltd Paperback 5 January 1995 from£8.08 | RRP: £5.99
• Loitering with Intent: The Apprentice v.2: The Apprentice Vol 2 by Peter O'Toole Macmillan Hardcover 7 June 1996 from£27.00 | RRP: £20
• The Secret of Nimh by Robert C. O'Brien Scholastic Paperbacks Paperback 1 June 1982 from£56.76 | RRP: £1.32
• You Are the First Kid on Mars by Patrick O'Brien Putnam Publishing Group Hardcover 14 May 2009 from£13.99 | RRP: £11.52