TY  - RPRT
TI  - Development, testing, and evaluation of visual landing aids: consolidated progress report for the period April 1 to June 30, 1956
PY  - 1956
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS RPT 4820
DO  - 10.6028/NBS.RPT.4820
ER  -