TY  - RPRT
TI  - Development, testing and evaluation of visual landing aids: consolidated progress report for the period October 1 to December 31, 1967
PY  - 1968
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS RPT 9694
DO  - 10.6028/NBS.RPT.9694
ER  -