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• British Locomotives of the 20th Century: 1900-30 v. 1 by O.S. Nock Patrick Stephens Ltd Hardcover 28 March 1983 from£20.18 | RRP: £14.95
• Hugh Lane 1875-1915 by Robert O'Byrne The Lilliput Press Ltd Hardcover 7 November 2000 from£33.75 | RRP: £25
• Pillars of Irish Horsespeeding by Nicholas O'Hare Nicholas O'Hare Paperback 1 May 2005 from£N/A | RRP: £15
• Great Ships by Patrick O'Brien Walker & Company Paperback 30 January 2005 from£7.83 | RRP: £5.13
• African History: Western African History v. 1 (African History in Documents) by Robert O. Collins Markus Wiener Publishing Inc Paperback 30 November 1991 from£17.50 | RRP: £19.95
• An Introduction to the Physiology of Hearing by James O. Pickles Academic Press Hardcover 12 February 2008 from£53.98 | RRP: £39.99
• Around the Spanish Main: Travels in the Caribbean and the Guianas by Hugh O'Shaughnessy Ebury Press Hardcover 8 August 1991 from£20.23 | RRP: £14.99
• Getting Well Again: A Step-By-Step Self-Help Guide to Overcoming Cancer for Patients and Their Families by O. Carl Simonton J P Tarcher Hardcover from£16.69 | RRP: £11.49
• The Psychology of the "Sopranos": Love, Death, Desire and Betrayal in America's Favorite Gangster Family by Glen O. Gabbard Basic Books Paperback 20 June 2002 from£20.23 | RRP: £12.99
• Adventure Bible for Young Readers by Lawrence O. Richards Zondervan Paperback 7 July 2000 from£16.18 | RRP: £11.99
• Women Pirates: A Brief Anthology of Thirteen Notorious Female Pirates by F O Steele iUniverse.com Hardcover 27 September 2007 from£12.00 | RRP: £12
• The President, the Pope and the Prime Minister: Three Who Changed the World by John O'Sullivan Regnery Publishing Inc Hardcover 25 November 2006 from£31.03 | RRP: £16.99
• Daughter of Egypt (Leisure Historical Romance) by Constance O'Banyon Dorchester Publishing Mass Market Paperback 1 July 2007 from£8.08 | RRP: £5.99
• If I Die in a Combat Zone by Tim O'Brien HarperCollins Publishers Ltd Paperback 7 August 1980 from£3.37 | RRP: £2.5
• A Kingdom of Saints: Early Retablos of New Mexico: A Postcard Collection by Michael O'Shaughnessy Museum of New Mexico Press (Red Crane Books) Paperback 1 October 1993 from£7.75 | RRP: £7.5
• Dr. John Langdon Down and Normansfield by Ward O'Conor The Langdon Down Centre Trust Paperback 1 July 2009 from£10.12 | RRP: £7.5
• Physical Education in Primary Schools by Joseph O. Toluhi Evans Brothers Ltd Paperback 22 March 1976 from£5.33 | RRP: £3.95
• My Lover's Lover by Maggie O'Farrell Headline Review Hardcover 8 April 2002 from£17.53 | RRP: £12.99
• Liverpool: Our City, Our Heritage by Freddy O'Connor The Bluecoat Press Paperback 31 December 1994 from£10.78 | RRP: £7.99
• Never Forget A Number or A Date by Dominic O'Brien Chronicle Books Paperback 1 July 2002 from£5.19 | RRP: £3.2
• 'Nobby' Clarke: Churchill's backroom boy by Bernard O'Connor lulu.com Paperback 23 August 2011 from£8.98 | RRP: £8
• Nietzsche within Your Grasp by Shelley O'Hara John Wiley & Sons Paperback 11 June 2004 from£6.73 | RRP: £3.99
• Where's Home, Daddy Bear? by ,O'Byrne, Nicola Walker Books Hardcover 3 May 2018 from£9.59 | RRP: £
• Desolation Island (Paragon Softcover Large Print Books) by Patrick O'Brian Chivers Large print (Chivers, Windsor, Paragon & C Paperback 1 February 2002 from£17.53 | RRP: £12.99
• Disciples of All Nations: Pillars of World Christianity (Oxford Studies in World Christianity) by Lamin O. Sanneh OUP USA Paperback 29 November 2007 from£24.10 | RRP: £12.99