TY  - BOOK
AU  - Singh,A.K..
AU  - Singh,R.P..
TI  - Human health and environment / 
SN  - 8170248469
U1  - 577 
PY  - 1997///
CY  - New Delhi : 
PB  - APH Publishing , 
KW  - ECOLOGY
N1  - NULL
ER  -