000
00273nam a2200109Ia 4500
008
220606s9999 xx 000 0 und d
100
_a
SINGH B.B.
_9
11930
245
0
_a
ENVIRMENTAL SCIENCE
260
_b
RAMESH PUBLICATION NEW DELHI
_c
2013
300
_a
296
942
_c
BK
999
_c
106812
_d
106812