000 00265nam a2200109Ia 4500
008 221001s1983 xx 000 0 eng d
082 _a910 CON
245 0 _aConcepts and approaches
260 _aNew Delhi
_bHeritage
_c1983
300 _axii, 320p.
942 _2ddc
_cBK
999 _c21568
_d21568