TY  - BOOK
AU  - ASTHANA (D K)
AU  - ASTHANA (Meera)
TI  - Textbook of environmental studies
SN  - 9788121927642
U1  - 574.5 ASTT 
PY  - 2018///
CY  - New Delhi
PB  - S. Chand & Co. Ltd.
KW  - Textbook
KW  - studies
KW  - environmental
ER  -