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• Howett, G. L.; Kelly, K. L.; Pierce, E. T.
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  Emergency Vehicle Warning Lights: State of the Art. Final Report.
  National Bureau of Standards, Washington, DC
  Law Enforcement Assistance Admin., Washington, DC, NBS SP 480-16, September 1978,

• Pierce, E. T.; Kelly, K. L.; McPherson, M. A.; Howett, G. L.; Booker, R. L.
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  Emergency Vehicle Warning Devices. Interim Review of the State-of-the-Art Relative to Performance Standards.
  National Bureau of Standards, Washington, DC
  NBS 10 478, May 1972,