000 00270nam a2200121Ia 4500
100 _aPotter, F.F.
942 _cBK
654 _a
245 _aThe teaching of arithmetic
260 _aLondon
_bSir Isaac Pitman & Sons
_c1947
082 _a375.511
300 _bHb
_aix,462
999 _c421561
_d421561
041 _aeng