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• Teach Yourself Irish Complete Course Audio Package with Book (Teach Yourself (NTC)) by Diarmuid O'Se,Joseph Sheils McGraw-Hill Companies Paperback 1 September 2002 from£33.05 | RRP: £18.13
• Deep-Sky Companions: The Caldwell Objects by Stephen James O'Meara Cambridge University Press Hardcover 3 February 2003 from£26.02 | RRP: £26.99
• KS3 ICT Course: Student's Book Year 9 (Success for Schools) by Sean O'Byrne,Chris Guy Letts Educational Paperback 30 April 2004 from£10.80 | RRP: £6.5
• Working a Duck: The Arts of Raising, Cooking, and Eating Duck, and of Matching Duck With Wine, Including More Than 75 Recipes for Sauces, Soups, Salads by Melicia Phillips,Sean O. McElroy Doubleday Hardcover 1 February 1993 from£24.63 | RRP: £16.95
• Berlin Bunker by James P. O'Donnell Littlehampton Book Services Ltd Hardcover 1 April 1979 from£9.38 | RRP: £7.95
• Topology and Normed Spaces (Mathematics) by G.J.O. Jameson Chap.& H. Hardcover 27 June 1974 from£21.62 | RRP: £10.75
• Vampires, Elephants and Aliens 5th Class Skills Book (Fireworks) by Caroline Quinn,Michael O'Reilly Gill & Macmillan Ltd Paperback 31 May 2012 from£10.80 | RRP: £7.99
• IELTS Strategies for Study by Michael Garbutt,Kerry O'Sullivan NCELTR Publications (National Centre for English L Audio Cassette 1 December 2001 from£11.32 | RRP: £9.99
• Eriugena by John J. O'Meara Clarendon Press Hardcover 12 May 1988 from£153.99 | RRP: £71
• When the President Calls by Trevor Birney,Julian O'Neill Guildhall Press Paperback 1 November 1997 from£12.08 | RRP: £8.95
• Sternmania: The Unofficial Guide to the Howard Stern Show by Ray D. O'Fan Bantam Dell Pub Group (P) Paperback 1 February 1994 from£7.87 | RRP: £5.54
• The Magic Bridle and Other Folktales from Great Britain and Ireland by Forbes Stuart,Richard O'Connor Frederick Muller Ltd Hardcover 11 November 1974 from£3.98 | RRP: £3.5
• Radical Parody: American Culture and Critical Agency After Foucault (The Social Foundations of Aesthetic Forms) by Daniel T. O'Hara Columbia University Press Paperback 20 December 1994 from£32.40 | RRP: £20.5
• Ireland's Unfinished Revolution: An Oral History by Kenneth Griffith,Timothy O'Grady Roberts Rinehart Pub Paperback 1 February 1999 from£15.71 | RRP: £10.82
• Communicating Your Case for Support by J. Isaacs,T. O'Sullivan Open University Worldwide Paperback 2 October 2007 from£33.68 | RRP: £24.95
• The Feckin' Book of Irish History: for anyone who hasn't been paying attention for the last 30,000 years (The Feckin' Collection) by Colin Murphy,Donal O'Dea O'Brien Press Hardcover 16 March 2009 from£8.79 | RRP: £10.99
• The Statues in the Block and Other Poems (1884) by John Boyle O'Reilly Unknown Paperback 31 October 2007 from£15.52 | RRP: £12.95
• Daniel O'Donnell's Ireland: Songs and Scenes from My Homeland by Daniel O'Donnell; Michael McDonagh Virgin Books Hardcover 4 October 2007 from£27.00 | RRP: £20
• The Arms Park: Heart of a Rugby Nation by Bill O'Keefe,Emyr Young Y Lolfa Paperback 1 March 2012 from£9.95 | RRP: £9.95
• H.H.Richardson: Architectural Forms for an American Society by James F. O'Gorman University of Chicago Press Paperback 1 October 1990 from£17.21 | RRP: £12.75
• The Case of the Trail Trap and Other Mysteries (EDGE - Max Finder) by Liam O'Donnell,Michael Cho Franklin Watts Paperback 27 October 2011 from£10.78 | RRP: £7.99
• Half a Wing, Three Engines and a Prayer: B-17's Over Germany ("Aviation Week" Books) by Brian D. O'Neill McGraw-Hill Professional Paperback 1 May 1999 from£15.88 | RRP: £10.99
• Mastering Mathematics (Macmillan master series) by O.W. Perry,Joyce Perry Macmillan Hardcover 1 March 1982 from£12.08 | RRP: £10
• Sumner Welles, Postwar Planning, and the Quest for a New World Order, 1937-1943 (Gutenberg-E) by Christopher D. O'Sullivan Columbia University Press Hardcover 16 January 2009 from£75.33 | RRP: £34
• Militant and Triumphant: William Henry O'Connell and the Catholic Church in Boston, 1859-1944 by James M. O'Toole University of Notre Dame Press Paperback 31 March 1993 from£31.41 | RRP: £25.5