000
00294nam a22001337a 4500
003
OSt
020
_a
9788178129587
100
_a
B B Singh
245
_a
Objective Environmental Science
250
_a
1905
260
_a
New Delhi
_b
Ramesh Publishing House
300
_a
292pp
942
_2
ddc
_c
BK
999
_c
52549
_d
52549