000 00313nam a2200121Ia 4500
001 73088
008 240126s9999||||xx |||||||||||||| ||und||
245 0 _aModern mathematics No. 6, some properties of number system
260 _aDelhi
260 _bAll India Educational Supply Co.
260 _c1987
942 _cBK
999 _c73088
_d73088