000
00274nam a2200109Ia 4500
008
220201s1996 xx 000 0 eng d
100
_a
Chaudhary, AK & Om Prakash
245
0
_a
Envrionmental engineering
260
_b
Dhanpat Rai & Sons
_c
1996
300
_a
145
942
_2
ddc
999
_c
86557
_d
86557