000			00281nam a22001217a 4500
082			_a153.15 _bBLO.M
100			_aBlock, James H
245			_aMastery learning / _cby James H Block
260			_aNew York : _bHolt, _c1947.
300			_a152p. :
650			_a Learning
942			_cBK
999			_c632973 _d632973