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• Problem Dog: Behaviour and Misbehaviour by Valerie O'Farrell Methuen Publishing Ltd Paperback 23 November 1992 from£9.43 | RRP: £6.99
• Africa: A Short History by Robert O. Collins Markus Wiener Publishing Inc Paperback 1 July 2006 from£22.52 | RRP: £22.5
• In Search of the Truth: British Injustice and Collusion in Northern Ireland by Michael O'Connell The Collins Press Paperback 24 April 2017 from£11.99 | RRP: £
• Auckland Regiment 1914-1918 2004: Being an Account of the Doings on Active Service of the First, Second and Third Battalions of the Auckland Regiment by O. E. Burton Naval & Military Press Ltd Hardcover 20 June 2006 from£34.25 | RRP: £38
• Killing State: 1 (A Michael North Thriller) by O'Reilly, Judith Loughman Press Paperback 15 March 2018 from£7.59 | RRP: £
• In Search of Nature (Allen Lane Science) by Edward O. Wilson Allen Lane Hardcover 26 June 1997 from£22.93 | RRP: £16.99
• Penny the Star (Penny the Pencil Series) by Eileen O'Hely The Mercier Press Ltd Paperback 1 June 2007 from£10.93 | RRP: £7.99
• Bond Pricing and Portfolio Analysis: Protecting Investors in the Long Run by O De LaGrandville MIT Press Hardcover 27 October 2000 from£22.93 | RRP: £70.95
• World's Worst Jokes by Tom O'Connor Robson Books Ltd Paperback 1 January 1998 from£3.91 | RRP: £5.95
• An Ambush of Shadows: Bk. 5: The Pelbar Cycle (Beyond Armageddon) by Paul O. Williams University of Nebraska Press Paperback 15 December 2005 from£11.99 | RRP: £10.99
• The Great Irish Famine by John O'Rourke Veritas Publications Hardcover 1 December 1989 from£33.68 | RRP: £14.95
• On Human Nature (Penguin Science) by Edward O. Wilson Penguin Books Ltd Paperback 1 March 2001 from£8.08 | RRP: £5.99
• Force Majeure by Daniel O'Mahony Telos Publishing Ltd Paperback 20 August 2007 from£10.78 | RRP: £7.99
• The Summer King (Chronicles of Faerie) by O.R. Melling Harry N. Abrams, Inc. Paperback 1 May 2007 from£11.30 | RRP: £7.95
• Field of Fire (Berkley Prime Crime Mysteries) by James O. Born Berkley Trade Pub Paperback 5 February 2008 from£9.70 | RRP: £5.42
• Loughs of Ireland: An Angler's Guide (Fly Fishing International) by Peter O'Reilly Stackpole Books Hardcover 1 March 1999 from£40.50 | RRP: £23.7
• Katie Taylor: Journey to Olympic Gold by Jason O'Toole Gill & Macmillan Ltd Paperback 16 October 2012 from£14.83 | RRP: £10.99
• The Hunter's Moon (Chronicles of Faerie) by O.R. Melling Harry N. Abrams, Inc. Paperback 27 May 2005 from£13.43 | RRP: £9.95
• Bahamas Speed Weeks: Revised Edition Including the Revival Meetings by Terry O'Neil Dalton Watson Fine Books Hardcover 5 December 2013 from£95.00 | RRP: £95
• System Shock (Graphic Quest) by Liam O' Donnell Stone Arch Books Paperback 31 January 2008 from£6.73 | RRP: £4.99
• World Music: The Basics by Richard O Nidel Routledge Paperback 16 December 2004 from£18.88 | RRP: £11.99
• Latin American Male Homosexualities by Stephen O. Murray University of New Mexico Press Paperback 1 January 2001 from£27.67 | RRP: £20.5
• Olympic Equestrian: A Century of International Horse Sport by Jennifer O. Bryant Eclipse Press Paperback 1 June 2008 from£34.46 | RRP: £18.99
• Pennsylvania: A Guide to Unique Places (Off the Beaten Path Pennsylvania) by Christine O'Toole GPP Travel Paperback 2 June 2009 from£16.13 | RRP: £10.36
• Gunfighters: Airworthy Fighter Airplanes of WW2 & Korea by Michael O'Leary Osprey Paperback 27 November 1986 from£9.38 | RRP: £3.95