TY  - BOOK
ED  - Bureau of Indian Standards                                                                                                                                                                                                                                     . 
TI  - Safety requirements for floor and wall openings, railings and toe boards 4912-1978 / 
U1  - 690.22 
PY  - 1989///
CY  -  : 
PB  - Bureau of Indian Standards , 
ER  -