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John Keen
Harold 'Doc' Keen and the Bletchley Park Bombe John Keen 2 Revised Edition

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Harold 'Doc' Keen and the Bletchley Park Bombe

89 pages, 6 half-tones, 17 diagrams

Media	Books Paperback Book (Book with soft cover and glued back)
Released	August 21, 2012
ISBN13	9780947712488
Publishers	M.& M.Baldwin
Pages	89
Dimensions	209 × 152 × 5 mm · 188 g

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