000 00262nam a2200121Ia 4500
008 190719s9999 xx 000 0 und d
100 _aBansi Lal
245 0 _aN E Plain trigonometry
250 _a16th
260 _aDelhi
_bAtma Ram
650 _aMath
942 _cBK
999 _c542
_d542