TY  - RPRT
TI  - Emergency vehicle warning lights : state of the art
AU  - Howett, Gerald L
AU  - Kelly, Kenneth L
AU  - Pierce, E Thomas
PY  - 1978
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS SP 480-16
DO  - 10.6028/NBS.SP.480-16
ER  -