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First published in Oxford Bookworms 1991
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ISBN 978 0 19 479112 0
A complete recording of this Bookworms edition of Chemical Secret is available on audio CD ISBN 978 0 19 479093 2
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Illustrated by: Chris Koelle
Word count (main text): 10,150 words
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www.oup.com/bookwormse-Book ISBN 978 0 19 478672 0e-Book first published 2012
