TY  - BOOK
AU  - Galappatti,Janaki
AU  - Hettiarachchi,Nirmali
TI  - Our world of science
SN  - 9559055135
AV  - Q163 .O97 1990
PY  - 1990///
CY  - Colombo
PB  - The British Council, Colombo
KW  - Science
N1  - Science – General
ER  -