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Author details
This unit was written by Baldev Singh on behalf of the Specialist Schools Trust.
Other acknowledgements
Grateful acknowledgement is made to the following sources for permission to reproduce material within this unit:
Photos, eye and compact disc: © Getty Images
Various texts and storyboard illustrations: Courtesy of Baldev Singh
Photo, film reels: © morgueFile
Every effort has been made to contact copyright owners. If any have been inadvertently overlooked, the publishers will be pleased to make the necessary arrangements at the first opportunity.
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