SLS : 452 : 1979 : Specification for concrete non-pressure pipes
- Colombo BUREAU OF CEYLON STANDARDS 1979
- 33p.
STD2629
SLS 452 : 1979
a621.643.2.666.972
SRI LANKA-STANDARDS
STANDARDS-SRI LANKA
STD2629
SLS 452 : 1979
a621.643.2.666.972
SRI LANKA-STANDARDS
STANDARDS-SRI LANKA