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• Dragon in the Woodshed by John O'Leary Folens Publishers UK Paperback 1 April 1988 from£8.08 | RRP: £5.99
• Exemplary Damages by Dennis O'Driscoll Anvil Press Poetry Paperback 11 November 2002 from£8.07 | RRP: £7.95
• Rising Out: Sean Connolly of Longford (1890-1921) (Classics of Irish History) by Ernie O'Malley University College Dublin Press Paperback 1 September 2007 from£13.95 | RRP: £17
• Fermenting Revolution: How to Drink Beer and Save the World by Chris O'Brien New Society Publishers Paperback 1 November 2006 from£18.88 | RRP: £13.99
• Madame: An Intimate Biography of Helena Rubinstein by Patrick. O'Higgins Viking Press Hardcover 1 July 1971 from£93.73 | RRP: £
• The Complete Lone Pine: Exploring the Lone Pine Books of Malcolm Saville by Mark O'Hanlon Mark O'Hanlon Hardcover 23 May 2005 from£26.98 | RRP: £19.99
• After Progress: Why We Should Change Our Thinking by Anthony O'Hear Bloomsbury Publishing PLC Hardcover 27 September 1999 from£20.23 | RRP: £14.99
• The Popular Print in England by Sheila O'Connell British Museum Press Hardcover 1 May 1999 from£33.75 | RRP: £25
• Sorcery Club (The Dennis Wheatley library of the occult) by Elliott O'Donnell Sphere Paperback 2 May 1974 from£0.60 | RRP: £0.45
• FOLLOWING LOVE (Arabesque) by Celeste O. Norfleet KIMANI PRESS Mass Market Paperback 3 January 2008 from£8.08 | RRP: £5.99
• Thy Neighbour's Wife by Liam O'Flaherty Merlin Publishing Paperback 16 March 1992 from£9.43 | RRP: £6.99
• The Cambridge Encyclopedia of Meteorites by O. Richard Norton Cambridge University Press Hardcover 7 March 2002 from£38.00 | RRP: £38
• Into the Arena by Sean O'Kane Silver Moon Books Ltd Paperback 1 February 2003 from£2.68 | RRP: £6.99
• Wordgloss: A Cultural Lexicon by Jim O'Donnell The Lilliput Press Ltd Paperback 1 October 2005 from£20.23 | RRP: £14.99
• When Love Calls (Arabesque) by Norfleet,Celeste O. KIMANI PRESS Mass Market Paperback 8 May 2008 from£8.08 | RRP: £5.99
• Get it: Irish Driving Test by Brian O'Leary Poolbeg Press Ltd Paperback 16 May 2005 from£8.18 | RRP: £6.99
• The Brontes Treasury: The Life, Times and Works of Charlotte, Emily and Anne by Jane O'Neill Welbeck Publishing Hardcover 14 June 2018 from£7.99 | RRP: £
• Beyond The Mist: Reflections On Irish Mythology by Peter O'Connor Gollancz Paperback 5 July 2001 from£10.78 | RRP: £7.99
• Paul Cardinal Cullen: Portrait of a Practical Nationalist by Ciaran O'Carroll Veritas Publications Hardcover 1 November 2008 from£43.20 | RRP: £19.95
• Callaghan: A Life by Kenneth O. Morgan Oxford Paperbacks Paperback 6 May 1999 from£20.23 | RRP: £14.99
• Island of the Blue Dolphins (Penguin Readers Simplified Text) by Scott O'Dell Longman Paperback 9 November 1999 from£4.70 | RRP: £4.7
• The Big Fellow: Life of Michael Collins by Frank O'Connor Poolbeg Press Ltd Paperback 1 June 1991 from£9.43 | RRP: £6.99
• Last Slave Standing: (A BDSM Novel) (Arena Novel) by Sean O'Kane Barrington Hall Publishing Paperback 18 March 2010 from£8.73 | RRP: £7.99
• George Washington Carver, Scientist and Symbol by Linda O. McMurry Oxford University Press Inc Paperback 1 January 1981 from£13.77 | RRP: £10
• The Solar System (Go Facts: Space) by Maureen O'Keefe A & C Black Publishers Ltd Hardcover 10 December 2006 from£8.53 | RRP: £8.99