TY  - BOOK
AU  - Purkayastha, G.
TI  - Environmental studies
SN  - 8127233374
U1  - 352.6 
CY  - Guwahati
PB  - Kalyani Publishers
KW  - Environmental Science
KW  - Environmental Studies
N1  - Based on UGC, Dibrugarh University, Gauhati University and Syllabus of other Indian Universities; Includes bibliographical references
ER  -