TY  - RPRT
TI  - Visibility of exit directional indicators 
AU  - Collins, Belinda L
AU  - Goodin, Peter J
PY  - 1991
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - NIST IR 4532
DO  - 10.6028/NIST.IR.4532
ER  -