TY  - RPRT
TI  - Visual range : concepts, instrumental determination, and aviation applications
AU  - Douglas, C A
AU  - Booker, R L
PY  - 1977
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS MONO 159
DO  - 10.6028/NBS.MONO.159
ER  -