Tactile or sound or both?
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Combining touch sensitive tactile maps with sound seems efective (e.g. 
Griffin, 2002 or Parkes 1994). See also  TouchGraphics product.
 
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May be best for training 
 
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Unrealistic to believe that all government statistics users would have convenient access to all maps and hardware. 
 
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We focus on a sound only approach
 
 
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