TY  - BOOK
AU  - Gray,Susan H.
TI  - Ecology: The study of ecosystem 
SN  - 9780531282694
PY  - 2012///
CY  - New York
PB  - Scholastic pub
KW  - Ecology
KW  - Study
KW  - Ecosystem
KW  - Philippines
N1  - 1
ER  -