000			00332nam a2200133Ia 4500
082			_a510 _bHEE
100			_aHeard, T. J. _9201791
245			_aExtending mathematics _cT J. Heard
260			_aLondon: _bOxford University Press, _c1974.
300			_a461p.
546			_aeng
650			_aMathematics-Textbooks _9201792
942			_cBK
999			_c81357 _d81357