The Necessary Aptitude 2012, Windsor, Bath

ISBN-13: 9781445877952

Large type edition

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The Necessary Aptitude 2012, Paragon, Bath

ISBN-13: 9781445877969

Large type edition

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The Necessary Aptitude 2011, Random House Audiobooks, London

ISBN-13: 9781846573101

Unabridged edition

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The Necessary Aptitude 2011, Ebury Press, London

ISBN-13: 9780091945039

Mass-market paperback

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