TY  - BOOK
AU  - Tyagi,, O.D.
AU  - Mehra, M
TI  - Textbook of environmental chemistry / 
SN  - 81-7041-352-4
U1  - 577.14 
PY  - 1990///
CY  - New Delhi
PB  - Anmol
KW  - Ecology
KW  - Life sciences
KW  - Biology
ER  -