TY  - GEN
AU  - P.R.vd; ed
AU  - Gurdeep Raj.     
TI  - Encyclopaedia of environmental sciences :  man and environmen Vol-18
SN  - 8171582796
U1  - 333.703 
PY  - 1992///
CY  - New Delhi

PB  - Akashdeep Publishing House
ER  -