TY  - GEN
AU  - Williams ,   D.A..S
AU  - Hewage Sujtha
AU  - Subasinghe Kumara
TI  - Chemistry: general chemistry and inorganic chemistry
U1  - 546 
PY  - 1983///
CY  - Nugegoda
PB  - Open university
KW  - CHEMISTRY
ER  -