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• Joseph Banks: A Life by P O'Brian Chicago University Press Paperback 13 November 1997 from£17.23 | RRP: £13
• Conamara Blues: A Collection of Poetry by John O'Donohue Doubleday Hardcover 2 November 2000 from£17.53 | RRP: £12.99
• Ergonomic Design for Organizational Effectiveness by Michael J. O'Neill CRC Press Hardcover 25 March 1998 from£71.53 | RRP: £49.99
• An Only Child AND My Father's Son: An Autobiography (Penguin Modern Classics) by Frank O'Connor Penguin Classics Paperback 7 July 2005 from£14.83 | RRP: £10.99
• Classical and Contemporary Sociology: Theory and Issues by Mike O'Donnell Hodder Arnold Paperback 23 February 2001 from£22.93 | RRP: £16.99
• The Jury Must Die by Carol O'Connell Hutchinson Hardcover 2 October 2003 from£13.48 | RRP: £9.99
• Sermons and Soda-Water by John O'Hara Random House Inc (T) Hardcover 1 June 1960 from£12.75 | RRP: £8.4
• Kade: Sun Of Perdition by Sean Patrick O'Reilly Arcana Studio Hardcover 30 April 2008 from£20.23 | RRP: £14.99
• The Granny by Brendan O'Carroll Plume Books Paperback 1 August 2000 from£16.60 | RRP: £9.49
• The Final, Unfinished Voyage of Jack Aubrey by Patrick O'Brian HarperCollins Paperback 16 May 2005 from£17.53 | RRP: £12.99
• Jesus: A Portrait by Gerald O'Collins Darton,Longman & Todd Ltd Paperback 24 March 2008 from£12.95 | RRP: £12.95
• East End Trilogy: Sins of the Fathers by Gilda O'Neill William Heinemann Ltd Hardcover 18 August 2004 from£24.28 | RRP: £17.99
• Collecting by Design: Silver and Metalwork of the Twentieth Century: the Margo Grant Walsh Collection (Houston Museum of Fine Arts) by T O'Brien Yale University Press Paperback 20 March 2008 from£11.70 | RRP: £18
• The Silver Mistress by Peter O'Donnell Macmillan Paperback 23 May 1975 from£73.72 | RRP: £1.95
• The Letter of Marque by Patrick O'Brian Fontana Press Paperback 24 August 1989 from£8.08 | RRP: £5.99
• The Vanishing Act of Esme Lennox by Maggie O'Farrell Houghton Mifflin Harcourt (HMH) Hardcover 24 October 2007 from£15.56 | RRP: £15.6
• Commodore (Aubrey-Maturin) by P O'Brian W. W. Norton & Co. Paperback 26 January 1996 from£17.53 | RRP: £9.99
• The Reverse of the Medal by Patrick O'Brian Fontana Press Paperback 12 March 1987 from£8.08 | RRP: £5.99
• I Could Read the Sky by Timothy E. O'Grady The Harvill Press Hardcover 2 October 1997 from£40.50 | RRP: £30
• At Swim-two-birds (Twentieth Century Classics) by Flann O'Brien Penguin Books Ltd Paperback 29 March 1990 from£9.43 | RRP: £6.99
• Test Engineering: A Concise Guide to Cost-effective Design, Development and Manufacture (Quality and Reliability Engineering Series) by Patrick O'Connor Wiley-Blackwell Hardcover 26 April 2001 from£74.80 | RRP: £56.5
• Pilgrim Paths in Ireland: From Slieve Mish to Skellig Michael (Walking Guides) by John G. O'Dwyer The Collins Press Paperback 7 April 2017 from£10.39 | RRP: £
• Lost Voices: Memories of a Vanished Way of Life by Gilda O'Neill Arrow Books Ltd Paperback 2 November 2006 from£18.57 | RRP: £7.99
• The Lover's Knot: A Someday Quilts Mystery by Clare O'Donohue Plume Books Paperback 30 September 2008 from£13.98 | RRP: £9.49
• The Far Side of the World (Aubrey-Maturin) by P O'Brian W. W. Norton & Co. Hardcover 29 March 1995 from£23.33 | RRP: £16.99