TY  - GEN
AU  - Kumara , V.
AU  - Abeysekara , A.M.
TI  - The degee of bachelor of science block 3 Vol; 1 : level three chemistry 
U1  - 574 
PY  - 1984///
CY  - Nugegoda
PB  - Opean University
KW  - CHEMISTRY
ER  -