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• The Spirit of the Pond by Tom O'Reilly Macmillan Hardcover 13 September 1996 from£17.53 | RRP: £12.99
• The Story of Chicago May by Nuala O'Faolain Michael Joseph Ltd Paperback 31 August 2006 from£7.99 | RRP: £7.99
• Sounds: A Philosophical Theory by Casey O'Callaghan OUP Oxford Paperback 14 January 2010 from£18.89 | RRP: £16.99
• Ralph Richardson: An Actor's Life (Methuenbiography) by Garry O'Connor Methuen Publishing Ltd Paperback 13 September 1999 from£13.48 | RRP: £9.99
• Frommer's Nicaragua and El Salvador (Frommer's Nicaragua & El Salvador) by Charlie O'Malley John Wiley & Sons Paperback 5 January 2010 from£18.88 | RRP: £13.99
• The Letter of Marque by Patrick O'Brian Harper Perennial Paperback 2 June 2008 from£10.78 | RRP: £7.99
• Fancy Nancy's Perfectly Posh Paper Doll Book by Jane O'Connor HarperFestival Paperback 29 December 2009 from£9.85 | RRP: £4.53
• The Secret of Nimh: Mrs. Frisby and the Rats of Nimh by Robert C. O'Brien Scholastic US Paperback 1 August 1995 from£6.07 | RRP: £4.5
• Ghost Train (Oxford Poets) by Sean O'Brien Oxford Paperbacks Paperback 30 September 1995 from£9.43 | RRP: £6.99
• Bounds of Justice by Onora O'Neill Cambridge University Press Paperback 26 October 2000 from£23.53 | RRP: £15.99
• Beyond Breathless (Harlequin Blaze) by Kathleen O'Reilly Harlequin Books Mass Market Paperback 1 January 2007 from£5.99 | RRP: £3.08
• Advertising and Integrated Brand Promotion, International Edition by Thomas O'Guinn South Western College Paperback 18 May 2008 from£91.78 | RRP: £43.99
• Stoics and Neostoics: Rubens and the Circle of Lipsius by Mark P.O. Morford Princeton University Press Hardcover 1 July 1992 from£64.80 | RRP: £33
• The Letter of Marque by Patrick O'Brian HarperCollins Hardcover 17 August 1998 from£22.93 | RRP: £16.99
• Ancestral Voices: Religion and Nationalism in Ireland by Conor Cruise O'Brien Poolbeg Press Ltd Hardcover 22 September 1994 from£10.78 | RRP: £7.99
• The Vanishing Act of Esme Lennox by Maggie O'Farrell Harvest Books Paperback 2 June 2008 from£12.69 | RRP: £9.49
• The Missing by Andrew O'Hagan Picador Paperback 13 September 1996 from£8.08 | RRP: £6.99
• Apocalypse: Warning, Hope, and Consolation by O'Brien, Michael D. Wiseblood Books Paperback 28 September 2018 from£23.95 | RRP: £
• Cousin Coat: Selected Poems by Sean O'Brien Picador Paperback 11 October 2002 from£9.99 | RRP: £10.99
• I (Heart) Puzzles (Littlest Pet Shop) by Jeff O'Hare Scholastic Paperback 1 June 2007 from£6.30 | RRP: £3.38
• The Earth on Show: Fossils and the Poetics of Popular Science, 1802-1856 by Ralph O'Connor Chicago University Press Hardcover 5 February 2008 from£92.34 | RRP: £31
• A New Introduction to Sociology by Mike O'Donnell Nelson Thornes Ltd Spiral-bound 1 September 1992 from£22.95 | RRP: £18.75
• Mrs Reinhart & Other Stories by Edna O'Brien Weidenfeld & Nicolson Hardcover 22 February 1990 from£16.13 | RRP: £11.95
• Find Me by Carol O'Connell Putnam Publishing Group Hardcover 28 December 2006 from£17.81 | RRP: £17.29
• My Friend Flicka by Mary O'Hara HarperPaperbacks Paperback 29 February 1988 from£6.73 | RRP: £4.99