000 00310nam a2200121Ia 4500
008 170101s1961 xx 000 0 und d
082 _a511 LAY
100 _aLay L. Clark
245 0 _aArithmetic : An Introduction to Mathematics.
260 _bThe macmillan Com.
_c1961
300 _a323 p
942 _2ddc
_cB
999 _c406566
_d406566