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• 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
• Shakespeare's Patron, William Herbert: Politics, Patronage and Power by Brian O'Farrell Continuum Paperback 10 February 2011 from£25.63 | RRP: £18.99
• Selected Poems Bernard O'Donoghue by Bernard O'Donoghue Faber and Faber Paperback 3 April 2008 from£12.89 | RRP: £12.99
• Developing Critical Thinking: The Speaking/Listening Connection by Virginia O'Keefe Boynton/Cook Publishers Inc US Paperback 12 October 1999 from£12.13 | RRP: £8.99
• The Things They Carried by Tim O'Brien Mariner Books Paperback 13 October 2009 from£10.07 | RRP: £10.14
• The Star of the Sea by Joseph O'Connor Random House Audiobooks Audio Cassette 1 July 2004 from£23.15 | RRP: £13.99
• Essays in the History of Ideas by Arthur O. Lovejoy Greenwood Press Hardcover 16 October 1978 from£39.15 | RRP: £21.95
• A Time to Every Purpose Under Heaven by Karl O. Knausgaard Portobello Books Ltd Hardcover 1 October 2008 from£25.63 | RRP: £18.99
• Did Thomas Crapper Really Invent the Toilet?: The Inventions That Changed Our Homes and Our Lives by Catherine O'Reilly Skyhorse Publishing Paperback 3 November 2008 from£14.83 | RRP: £10.36
• Tigers (True Books: Animals) by Ann O. Squire Children's Press(CT) Paperback 1 September 2005 from£7.31 | RRP: £4.71
• Introduction to the Study of African Culture by Eric O. Ayisi Heinemann Paperback 19 February 1979 from£7.42 | RRP: £5.5
• H.M.S. SURPRISE P O'BRIAN (Aubrey-Maturin) by P O'Brian W. W. Norton & Co. Hardcover 29 March 1995 from£24.28 | RRP: £17.99
• The Best Bar Trivia Book Ever: All You Need for Pub Quiz Domination by O’Neill, Michael Adams Media Corporation Paperback 31 October 2014 from£9.34 | RRP: £
• Consilience by Edward O. Wilson Little, Brown & Company Hardcover 17 September 1998 from£25.63 | RRP: £18.99
• Mark O'Connor: Contest Fiddling Championship Style [DVD] by Mark O'Connor Omnibus Press Paperback 1 October 2010 from£21.00 | RRP: £17.95
• One Hundred Flowers by Georgia O'Keeffe Phaidon Press Ltd Paperback 30 November 1990 from£8.08 | RRP: £5.95
• Advanced C++ Programming Styles and Idioms by James O. Coplien Addison Wesley Paperback 30 August 1991 from£41.52 | RRP: £48.99
• The Devil Rides Out by O'Grady, Paul Windsor Hardcover 1 August 2011 from£26.98 | RRP: £
• Killing Critics by Carol O'Connell Brilliance Corporation Audio CD 19 June 2009 from£31.57 | RRP: £19.05
• Ordnance Survey Letters: Donegal (Ordnance Survey Letters S.) by John O'Donovan Four Masters P. Hardcover 9 June 2000 from£33.75 | RRP: £45
• Mr. Gilhooley by Liam O'Flaherty Merlin Publishing Paperback 1 May 1991 from£6.73 | RRP: £4.99
• Murder, Mutiny and Mayhem: The Blackest-Hearted Villains from Irish History by Joe O'Shea O'Brien Press Paperback 1 October 2012 from£11.99 | RRP: £10.99
• Christian Education: Seeking to Become Like Jesus Christ by Lawrence O. Richards Zondervan Paperback 1 September 1988 from£17.99 | RRP: £16.99
• Once upon a Rose by Judith O'Brien Pocket Books (Mm) Paperback 1 May 1996 from£5.89 | RRP: £4.15
• Daniel O'Connell by Fergus O'Ferrall Gill & Macmillan Ltd Paperback 28 February 1998 from£9.43 | RRP: £7.99