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• One Hundred Flowers by Georgia O'Keeffe Phaidon Press Ltd Paperback 30 November 1990 from£8.08 | RRP: £5.95
• Motion to Suppress by Perri O'Shaughnessy Headline Book Publishing Paperback 2 November 1995 from£8.08 | RRP: £5.99
• British-Irish Relations and Northern Ireland: From Violent Politics to Conflict Regulation by Brendan O'Duffy Irish Academic Press Ltd Paperback 1 October 2007 from£14.56 | RRP: £19.95
• A Picture of Health: Hospitals and Nursing on Old Picture Postcards by Cynthia O'Neill Sidgwick & Jackson Ltd Cards 28 September 1989 from£8.03 | RRP: £5.95
• Advanced Engineering Mathematics by O'Neill Wadsworth Publishing Co Inc Paperback 14 June 2003 from£32.28 | RRP: £39.99
• Irish Historical Documents Since 1800 by Alan O'Day Gill & Macmillan Ltd Paperback 1 December 1992 from£17.53 | RRP: £15.99
• Trent and All That: Renaming Catholicism in the Early Modern Era by JW O'Malley Harvard University Press Hardcover 3 April 2000 from£44.48 | RRP: £29.95
• Harriet and Isabella by Patricia O'Brien Touchstone Books Hardcover 8 January 2008 from£17.55 | RRP: £16.95
• Dublin (Lonely Planet Encounter) by Oda O'Carroll Lonely Planet Publications Paperback 1 September 2007 from£9.43 | RRP: £6.99
• Rhetoric of Reaction: Perversity, Futility, Jeopardy by Albert O. Hirschman Harvard University Press Hardcover 20 February 1991 from£33.68 | RRP: £24.95
• A Pub on Every Corner: North Liverpool v. 3 by Freddy O'Connor The Bluecoat Press Paperback 1 November 1998 from£10.73 | RRP: £7.95
• The Star of the Sea by Joseph O'Connor Random House Audiobooks Audio Cassette 1 July 2004 from£23.15 | RRP: £13.99
• Advanced C++ Programming Styles and Idioms by James O. Coplien Addison Wesley Paperback 30 August 1991 from£41.04 | RRP: £48.99
• A Time to Every Purpose Under Heaven by Karl O. Knausgaard Portobello Books Ltd Hardcover 1 October 2008 from£25.63 | RRP: £18.99
• After You'd Gone by Maggie O'Farrell Headline Review Hardcover 6 April 2000 from£17.53 | RRP: £12.99
• Gettin' Old Ain't for Wimps by Karen O'Connor Harvest House Publishers,U.S. Paperback 1 August 2004 from£10.43 | RRP: £7.99
• The Black Widow: The Catherine Nevin Story by Niamh O'Connor O'Brien Press Ltd Paperback 18 July 2000 from£11.99 | RRP: £10.99
• Selected Poems Bernard O'Donoghue by Bernard O'Donoghue Faber and Faber Paperback 3 April 2008 from£12.89 | RRP: £12.99
• Wooden Womb Man by Elizabeth O'Neill bluechrome Publishing Paperback 30 September 2004 from£13.48 | RRP: £9.99
• The Things They Carried by Tim O'Brien Mariner Books Paperback 13 October 2009 from£13.64 | RRP: £10.14
• The Invisible Cut: How Editors Make Movie Magic by Bobbie O'Steen Michael Wiese Productions Paperback 1 April 2009 from£21.99 | RRP: £16.99
• The Great Strikes of 1877 (Working Class in American History) (The Working Class in American History) by David O. Stowell University of Illinois Press Paperback 15 January 2008 from£12.99 | RRP: £14.99
• The Compact Guide to the World's Religions (Compact Encyclopedia) (Compact Guide To... (Lion)) by Sean O'Callaghan Lion Hudson Plc Paperback 20 August 2010 from£10.19 | RRP: £10.99
• Finland's War of Choice by Henrik O. Lunde Casemate Paperback 30 October 2013 from£18.19 | RRP: £11.99
• A Good Man is Hard to Find (A Women's Press classic) by Flannery O'Connor Women's Press Ltd,The Paperback 1 September 2001 from£9.43 | RRP: £6.99