TY  - RPRT
TI  - Development, testing, and evaluation of visual landing aids : consolidated progress report for the period April 1 to June 30, 1968
PY  - 1968
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS report ; 9904
DO  - 10.6028/NBS.RPT.9904
ER  -