TY  - RPRT
TI  - Development, testing, and evaluation of visual landing aids : consolidated progress report for the period January 1 to March 31, 1968
PY  - 1968
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS report ; 9903
DO  - 10.6028/NBS.RPT.9903
ER  -