000 00272nam a22000977a 4500
008 150825b xxu||||| |||| 00| 0 eng d
082 _a510 EXN
100 _aEXNER ROBERT.M.
245 _aLOGIC IN ELEMENTARY MATHEMATICS:
260 _aNEW YORK:
_bMCGRAW-HILLBOOK COMPANY,INC.
_c1959.
999 _c874
_d874