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Readability of self-illuminated signs in a smoke-obscured environment /

Title:Readability of self-illuminated signs in a smoke-obscured environment /
Author:
Author:
Author:
Note:Washington, D.C. : U.S. Dept. of Transportation, Federal Aviation Administration, Office of Aviation Medicine, [1979]
  
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Subject:Aeronautics
Subject:Signs and signboards
Subject:Vision
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