000 00323nam a2200121Ia 4500
008 220201s1957 xx 000 0 eng d
082 _a510
_bBRR
100 _aBrrueckner, Loo J
245 0 _aDeveloping mathmatical understanding in the upper
260 _aPhiladelhia
_bJohn C Winston
_c1957
300 _a567
942 _2ddc
999 _c14250
_d14250