TY  - BOOK
AU  - Williamson,E.H.
TI  - Data book for pipe fitters and pipe welders
U1  - 621.8672 
PY  - 1977///
CY  - Calcutta
PB  - Rupa and Company
KW  - Pipe fitters
KW  - Pipe fittings
KW  - Welding
KW  - Pipe, plastics
KW  - Piping
ER  -