00281nam a2200097Ia 4500008004100000082001900041100002100060245004300081260004400124300001500168250404b        |||||||| |||| 00| 0 eng d  a515.1bC536.CB  aChildress, R. L.  aCalculus for business and economicsb/  aEnglewood Cliffs:bPrentice-Hall,c1972  axii, 267p.