000 00248nam a2200109Ia 4500
008 221001s1969 xx 000 0 eng d
082 _a336.54 BHA
245 0 _a1972
260 _aDelhi
_bUniversity of Delhi
_c1969
300 _a29p.
942 _2ddc
_cBK
999 _c6051
_d6051