000 00301nam a2200109Ia 4500
008 220201s1967 xx 000 0 eng d
100 _aIrving Drooyan & wolter Hadel
245 2 _aA programmed introduction to number system
260 _bNewyork:John Wiley & Sons
_c1967
300 _a262
942 _2ddc
999 _c78665
_d78665