TY  - RPRT
TI  - Guidelines for stair safety 
AU  - Archea, John
AU  - Collins, Belinda L
AU  - Stahl, Fred I
PY  - 1979
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS BSS 120
DO  - 10.6028/NBS.BSS.120
ER  -