TY  - RPRT
TI  - An investigation of beam-spreading techniques for semiflush-prismatic type airport-marker lights 
AU  - Wall, A C
AU  - Douglas, C A
PY  - 1964
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS RPT 8169
DO  - 10.6028/NBS.RPT.8169
ER  -