TY  - RPRT
TI  - Visual ranges of four obstruction lights 
AU  - Breckenridge, F C
AU  - Vaughan, Robert T
PY  - 1956
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS report ; 4659
DO  - 10.6028/NBS.RPT.4659
ER  -