TY  - BOOK
AU  - Cunningham William P
AU  -  Cunningham Mary Ann
TI  - Principles of environmental science :  Inquiry and   
SN  - 0070581126
U1  - U:(G:55), P4 
PY  - 2004///
CY  -  New Delhi 
PB  - Tata McGraw Hill India      
KW  - Geography - Environment
ER  -