TY  - BOOK
AU  - Markandey , Dilip Kumar
AU  - Markandey , Neelima Rajvaidya/
TI  - Environment surveillance
SN  - 8131300064
U1  - 363.7303 M331E 
PY  - 2006///
CY  - New Delhi
PB  - APH publishing corporation
ER  -