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• Collins, B. L.
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  Visibility of Exit Signs and Directional Indicators.
  National Institute of Standards and Technology, Gaithersburg, MD
  Journal of the Illuminating Engineering Society, Vol. 20, No. 1, 117-133, Winter 1991
  National Electrical Manufacturers Assoc., Washington, DC,

• Collins, B. L.; Goodin, P. J.
  view article (1.0)

  Visibility of Exit Directional Indicators.
  National Institute of Standards and Technology, Gaithersburg
  NISTIR 4532
  National Electrical Manufacturers Assoc., Washington, DC, NISTIR 4532
  March 1991
  43 p.