000 00299nam a2200121Ia 4500
008 220201s1990 xx 000 0 eng d
100 _aGurucharan Singh
245 0 _aPadarth samgri & nirman vigyan k sidhant
250 _a4th
260 _bDelhi:Standard Pub
_c1990
300 _a627
942 _2ddc
999 _c85842
_d85842