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• Collins, B. L.; Danner, W. F.; Tibbott, R. L.
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  Communication Systems for Disabled Users of Buildings.
  National Bureau of Standards, Gaithersburg, MD
  NBSIR 81-2428
  Architectural and Transportation Barriers Compliance Board, Washington, DC, NBSIR 81-2428
  December 1981
  74 p.