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A Question of Proof

Published
Jan 1935
Main Genre
Mystery Mystery
Rating
Pages
338

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Paperback

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Paperback
Oct 1979 HarperCollins ISBN 0060804947
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Trade Paperback
Jun 2008 Rue Morgue Press ISBN 1601870256
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Trade Paperback
Jun 2012 Vintage ISBN 0099565358
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eBook

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eBook
May 2012 Vintage ISBN 1446476014
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eBook
Jun 2018 Agora Books ISBN B07DQLR7YV
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Audio

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Audible
Dec 2012 Audible Studios ISBN B00ASU486Y
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MP3 CD
Jul 2016 Brilliance Audio ISBN 1531843271
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Audio CD
Oct 2019 Brilliance Audio ISBN 1978667477
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Large Print

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Hardcover
Oct 1990 John Curley & Assoc ISBN 0792704460
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