TY  - BOOK
AU  - Cunningham, William P.
AU  - Cunningham, Mary Ann.
TI  -  Principles of environmental science:  inquiry and applications. 
SN  - 9780070647725
U1  - REF CUN 
PY  - 2007///
CY  - New Delhi
PB  -  Tata McGraw-Hill Publishing Company Ltd, 
KW  - Science
ER  -