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• The Gwaii by Sean Patrick O'Reilly Arcana Studio Paperback 11 August 2009 from£14.83 | RRP: £10.99
• The Genius (Penguin 60s) by Frank O'Connor Penguin Books Ltd Paperback 6 July 1995 from£0.81 | RRP: £0.6
• Villa's Rifles by Frank O'Rourke Signet Paperback 7 November 1978 from£64.64 | RRP: £
• Hollywood: The 100 Greatest Films by Derek O'Brien Penguin Books Paperback 15 September 2004 from£18.88 | RRP: £13.99
• The Mauritius Command by Patrick O'Brian HarperCollins Audio Cassette 20 January 1997 from£14.83 | RRP: £10.99
• Juno and the Paycock by Sean O'Casey Nelson Thornes Ltd Paperback 22 January 1988 from£7.76 | RRP: £5.75
• Measure for Measure by Elizabeth O'Reilly Heinemann Med. Spiral-bound 1 November 1973 from£26.98 | RRP: £1.85
• The Marriage Benefit: The Surprising Rewards of Staying Together in Midlife by Mark O'Connell Springboard Press Hardcover 2 October 2008 from£16.13 | RRP: £17.99
• Christo and Jeanne-Claude: Remembering the Running Fence: Remembering the Running Fence, Sonoma and Marin Counties, California, 1972-1976, A Documentation Exhibition by B O'Doherty University of California Press Hardcover 4 June 2010 from£95.85 | RRP: £34.95
• Fat Girl: One Woman's Way Out by Irene O'Garden HarperSanFrancisco Hardcover 10 October 1994 from£9.43 | RRP: £6.99
• The Saga of Dharmapuri by O.V. Vijayan Penguin Books Paperback 12 December 1988 from£5.33 | RRP: £3.95
• Pseudo-Dionysius and the Metaphysics of Aquinas by F. O'Rourke University of Notre Dame Press Paperback 1 October 2005 from£31.78 | RRP: £24.95
• Little Irish Mother by John O'Brien Angus & R Hardcover 20 October 1983 from£N/A | RRP: £3.95
• Historic Railway Disasters by O. S. Nock Arrow Books Ltd Paperback 20 November 1986 from£3.98 | RRP: £2.95
• The Twelve Holy Nights and the Spiritual Hierarchies by Sergei O. Prokof'ev Temple Lodge Publishing Hardcover 22 November 1993 from£21.53 | RRP: £15.95
• Dark Aura by Diana O'Hehir Berkley Prime Crime Paperback 2 June 2009 from£23.97 | RRP: £10.13
• Turn of the Tide (Coronet books) by Joan O'Neill Coronet Books Paperback 5 November 1998 from£8.08 | RRP: £5.99
• Work Out Sociology GCSE (Macmillan Work Out) by Gerard O'Donnell Palgrave Macmillan Paperback 14 August 1987 from£6.73 | RRP: £5.99
• The Penguin India Reference Yearbook 2007 by Derek O'Brien Penguin Books Paperback 8 January 2007 from£8.08 | RRP: £5.99
• Cambridge First Certificate Listening and Speaking Student's book (Cambridge First Certificate Skills) by Sue O'Connell Cambridge University Press Paperback 10 September 1992 from£10.80 | RRP: £7.5
• O'Brien Darcy : Two of A Kind:the Hillside Stranglers (Signet) by Darcy O'Brien Penguin Books Ltd Paperback 1 March 1987 from£4.87 | RRP: £3.78
• Girls in Their Married Bliss by Edna O'Brien Jonathan Cape Ltd Hardcover 1 December 1964 from£8.03 | RRP: £5.95
• "Wahoo": The Patrols of America's Most Famous World War II Submarine by Richard H. O'Kane Presidio Press Hardcover 1 October 1988 from£25.63 | RRP: £18.99
• Ethnographic Methods by Karen O'Reilly Routledge Hardcover 23 September 2004 from£130.95 | RRP: £85
• Blue at the Mizzen by Patrick O'Brian HarperCollins Audio Cassette 1 November 1999 from£14.83 | RRP: £10.99