TY  - BOOK
AU  - Nayar, K.R.  .
TI  - Ecology and health : a system approach / 
SN  - 81-7648-019-3
U1  - G:5 
PY  - 1998///
CY  - New Delhi : 
PB  - A.P.H. Publishing Corporation , 
KW  - Life science
ER  -