TY  - GEN
AU  - Peiris , H.T.R.
AU  - Hewavisenthi , S.
AU  - Ratnasiri , Nalini  B. 
AU  - Kotagama , S.W.
TI  - Ecology : course of study leading to the degree of bachelor of science level three
U1  - 591.7 
PY  - 1985///
CY  - Sri Lanka
PB  - Open university of sri lanka
KW  - ECOLOGY
KW  - ZOOLOGY
ER  -