TY  - RPRT
TI  - Evaluation of safety symbols 
AU  - Collins, Belinda L
AU  - Pierman, Brian C
PY  - 1979
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS IR 79-1760
DO  - 10.6028/NBS.IR.79-1760
ER  -