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by Nicholas BlakePaperback details (USA). details (UK). details (Germany). details (Canada). ISBN: 978-0-06-080494-7 ISBN-10: 0-06-080494-7 HarperCollins · 1979 |
| See also: | ||
| 2012 | Paperback | A Question of Proof |
| 1990 | Paperback | A Question of Proof (Curley Large Print Books) |