TY  - BOOK
AU  - VERMA (P S);AGARWAL (V K)
TI  - Environmental biology: principles of ecology
SN  - 978-81-219-0859-7
U1  - 574.5  23
PY  - 2017///
CY  - New Delhi
PB  - S Chand & Company Ltd
KW  - Ecology
ER  -