00475nam a2200205Ia 4500008004000000041000800040082001100048100001900059245005300078250000500131260004500136300001100181650001300192650001300205650000800218650000700226650001500233650001500248650000600263210210b1928   xxu||||| |||| 00| 0 eng d  aeng  a387/10  aHOUGHTON (H W)  aRational arithmetic for commercial students Ed 3  a  aLondonbGregg Publishing Division,c1928  axi,390  astudents  aRational  afor  aEd  acommercial  aarithmetic  a3