TY  - GEN
TI  - Specification for engineering drawing practice : SLS 409 : 1977
PY  - 1977///
CY  - Colombo
PB  - Bereau of Ceylon Standards
KW  - ENGINEERING DRAWING
KW  - ENGINEERING DRAWING PRACTICE
KW  - SLS 409
KW  - SLS 409: 1977
KW  - SRI LANKA STANDARDS
ER  -