TY  - RPRT
TI  - Description and performance characteristics of engineering models of visual alerting devices 
AU  - Lepkowski, J R
PY  - 1973
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS IR 73-253
DO  - 10.6028/NBS.IR.73-253
ER  -