TY  - RPRT
TI  - Development, testing, and evaluation of visual landing aids : consolidated progress report for the period October 1 to December 31, 1968
PY  - 1969
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS RPT 10006
DO  - 10.6028/NBS.RPT.10006
ER  -