TY  - RPRT
TI  - Methods of modifying the transmissometer system to permit its use during periods of very low runway visual range 
AU  - Douglas, C A
PY  - 1964
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS RPT 8188
DO  - 10.6028/NBS.RPT.8188
ER  -