000
00247nam a2200109Ia 4500
008
220201s1975 xx 000 0 eng d
100
_a
ISI
245
0
_a
IS: 2720-1975
260
_b
Indian Standard Institution
_c
1975
300
_a
33
942
_2
ddc
999
_c
80865
_d
80865