TY  - BOOK
ED  - Indian Standards Institution
TI  - Indian standard safety requirements for floor and wall openings railings and toe boards
PY  - 1969///
CY  - New Delhi
PB  - Indian Standards Institution
KW  -  Civil Engineering-Standards
KW  -  Standards 
KW  - NASA Thesaurus 
N1  - IS 4912 : 1968
ER  -