000 00291nam a2200121Ia 4500
008 211209s1980 xx 000 0 und d
041 _aeng
082 _a516.24 NAR/PIL
100 _aNARAYANAN
245 _aTRIGONOMETRY
260 _aNEW DELHI
_bVISHWANATHAN PVT. LTD.
_c1980
300 _a196
999 _c20762
_d20762