00278nam a2200109Ia 4500008004100000041000800041082001600049100001400065245004400079260003700123300000800160211209s1980    xx            000 0 und d  aeng  a510 N80 MAS  aMASON R D  aMATHEMATICS FOR BUSINESS AND CONSUMERS   bBUSINESS PUBLICATIONS INC.c1980  a506