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• Dundalk: No. 16: v. 16 (Irish Historic Towns Atlas) by Harold O'Sullivan Royal Irish Academy Paperback 1 November 2006 from£23.57 | RRP: £30
• HMS "Surprise" (Paragon Softcover Large Print Books) by Patrick O'Brian Chivers Large print (Chivers, Windsor, Paragon & C Paperback 1 October 2002 from£17.53 | RRP: £12.99
• Women in Global Migration, 1945-2000: A Comprehensive Multidisciplinary Bibliography (Bibliographies & Indexes in Women's Studies) by Eleanore O. Hofstetter Greenwood Press Hardcover 30 March 2001 from£52.64 | RRP: £95.95
• Hell-bent Kid (Great western novels) by Charles O. Locke Macmillan Paperback 7 January 1972 from£0.33 | RRP: £0.25
• Where the Rocks Float by Mary O'Malley Salmon Publishing Ltd Paperback 25 November 1993 from£8.08 | RRP: £5.99
• Cabernet: A Photographic Journey from Vine to Wine by Charles O'Rear Ten Speed Press Paperback 30 November 2001 from£22.93 | RRP: £16.99
• Believer's Promise Book: 700 Prayers and Promises from the N.I.V. by Lawrence O. Richards Zondervan Publishing House Paperback 1 March 1983 from£15.79 | RRP: £11.7
• Spawn by Robert O. Holles H.Hamilton Hardcover 1 February 1978 from£6.41 | RRP: £5.5
• Aspects of Central African History by T.O. Ranger Heinemann International Literature & Textbooks Paperback 31 December 1976 from£23.62 | RRP: £17.5
• Statistical Methods for Environmental Pollution Monitoring by Richard O. Gilbert Van Nostrand Reinhold International Hardcover 31 March 1987 from£61.12 | RRP: £52.5
• Field Engineer's Manual by Robert O. Parmley McGraw-Hill Inc.,US Paperback 1 June 1981 from£55.35 | RRP: £41
• Silent Stones by Mark O'Sullivan Merlin Publishing Paperback 1 April 1999 from£6.73 | RRP: £4.99
• Wish You Were Here by Stewart O'Nan Allen & Unwin Paperback 6 July 2017 from£7.99 | RRP: £9.99
• The Ancient Egyptian Coffin Texts: Spells 1-354 v. 1 (Modern Egyptology Series) by R.O. Faulkner Aris & Phillips Ltd Hardcover 11 February 1974 from£27.00 | RRP: £20
• Horace on Poetry: Volume 2, The Ars Poetica (Brink: Horace on Poetry) by C. O. Brink Cambridge University Press Hardcover 1 September 1985 from£94.50 | RRP: £
• Making Ecuadorian Histories: Four Centuries of Defining Power by O. Hugo Benavides University of Texas Press Paperback 1 June 2004 from£23.68 | RRP: £18.99
• The Long War: The Ira and Sinn Fein 1985 to Today (Irish Studies) by Brendan O'Brien Syracuse Univ Pr (Sd) Paperback 1 April 1995 from£20.23 | RRP: £13.47
• Play Therapy Treatment Planning and Interventions (Practical Resources for the Mental Health Professional) by Kevin O'Connor Academic Press Paperback 26 November 2012 from£53.63 | RRP: £45.99
• Mass Spectrometry Desk Reference by David O. Sparkman Global View Pub Paperback 30 June 2006 from£50.47 | RRP: £25.19
• The African City by Anthony O'Connor Routledge Paperback 9 July 2013 from£42.99 | RRP: £30
• Bride of Danger by Katherine O'Neal Bantam USA Paperback 30 September 1997 from£N/A | RRP: £4.84
• Managing People at Work: Concepts and Cases in Interpersonal Behaviour by O.Jeff Harris John Wiley & Sons Inc Hardcover 1 March 1976 from£42.25 | RRP: £31.3
• Optics of Rays, Wavefronts and Caustics (Pure and applied physics) by O.N. Stavroudis Academic Press Inc Hardcover 1 December 1972 from£59.38 | RRP: £104
• Europe and Economic Reform in Africa: Structural Adjustment and Economic Diplomacy (Routledge Studies in Development Economics) by Obed O. Mailafia Routledge Hardcover 17 July 1997 from£95.00 | RRP: £85
• Dublin's Suburban Towns, 1847-1930 (Maynooth Historical Studies) by Seamas O Maitiu Four Courts Press Ltd Paperback 2 November 2002 from£26.93 | RRP: £40