TY  - GEN
AU  - Gunawardana , Lalitha
AU  - De Abrew , Kamal
TI  - Introduction English for  science and technology book 1
U1  - 428 
PY  - 1983///
CY  - Nugeegoda
PB  - Open University
KW  - English Language
KW  - English Usage
ER  -