000			00399nam a2200145Ia 4500
005			20260205040630.0
008			260111s9999||||xx |||||||||||||| ||und||
082			_a511.07 B212T
100			_aBallard, P. B.
245		0	_aTeaching the essentials of arithmetic.
260			_aLondon _bUniversity of London Press _c1952
300			_a260p.
690			_aArithmetic -- Study and teaching.
942			_cBK
999			_c9321 _d9321