Smith, F.
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Clear Sign...Of the Right Color.
Fire Prevention,
No. 152,
26-28,
September 1982
Pierman, B. C.; Lerner, N. D.
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Testing Symbols for Fire Situations.
National Institute of Standards and Technology, Gaithersburg, MD
Fire Command,
Vol. 47,
No. 3,
12-13,
March 1980
Fire International
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Two Labels That Spell Safety Throughout the World.
Fire International,
No. 73,
71-74,
December 1981