TY  - BOOK
AU  - Anil Kumar De
AU  - Arnab Kumar De
TI  - Text book of environmental science
SN  - 9789381714546
U1  - 333.7 
PY  - 2014///
CY  - 1st ed.
PB  - Medtech
KW  - Major regions of atmosphere
KW  - Primary air pollutant sources
KW  - permissible noice levels
ER  -