TY  - RPRT
TI  - Development, testing, and evaluation of visual landing aids : consolidated progress report for the period July 1 to September 30, 1968
PY  - 1968
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS report ; 9964
DO  - 10.6028/NBS.RPT.9964
ER  -