TY  - BOOK
AU  - RAM Kalu
AU  -  SHARMA Sandeep
TI  - Textbook of environmental science
SN  - 9788178806655
U1  - U:(G:55), Q5 
PY  - 2015///
CY  -  New Delhi 
PB  - Rajat Publication        
KW  - Geography
N1  - Bibliography: P 235-255
ER  -