TY  - RPRT
TI  - Communication systems for disabled users of buildings 
AU  - Collins, Belinda L
AU  - Danner, William F
AU  - Tibbott, Robert L
PY  - 1981
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS IR 81-2428
DO  - 10.6028/NBS.IR.81-2428
ER  -