000 00294 a2200109 4500
082 _a510
_bOPM
245 _aNumber systems
_b: mathematics foundation course unit 34
260 _aBletchley Bucks:
_bOpen University Press,
_c1971.
300 _a53p.
650 _aMathematics
_9198447
942 _cBK
999 _c153197
_d153197