TY  - BOOK
AU  - P.D. Sharma 
AU  - Tyagi, Susheel Kumar.
TI  - Ecology and Environment 
SN  - 8171330379
U1  - 581.555 SHE 22
PY  - 1990///
CY  - London
PB  - Rastogi Publications
KW  - Ecology and Environment
N1  - Includes references
ER  -