This course was written by Lindsay Hewitt, Sarah Burton and Julie Robson.
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Figure 1.1: photo by Ross Finnie for © The Open University
Figure 1.2: © The Open University/Library image (model image only)
Figure 1.3: © The Open University/Library image (model image only)
Figures 1.4 and 1.5: courtesy of Sarah Burton for The Open University
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