TY  - RPRT
TI  - Instrumental colorimetry of retrorefective sign materials 
AU  - Nimeroff, I
AU  - Hall, W A
PY  - 1975
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS IR 74-518
DO  - 10.6028/NBS.IR.74-518
ER  -