000
00263nam a22001097a 4500
020
_a
9788121927642
100
_a
D.K. ASTHANA
245
_a
A TEXTBOOK OF ENVIRONMENTAL STUDIES
260
_a
NEW DELHI
_b
S. CHAND & COMPANY LTD
_c
2009
300
_a
460 P.
942
_c
BK
999
_c
7984
_d
7984