TY  - BOOK
AU  - De, Anil Kumar
AU  - De, Arnab Kumar
TI  - Environmental studies
SN  - 81-224-1293-9
U1  - 628.01 
PY  - 2001///
CY  - New Delhi
PB  - New age international
N1  - includes bibliographical references and index; The book emporium ,sil
ER  -