00000cam a22000004a 4500 UP-99796217605062382 Buklod 20230503092542.0 a r |||| u| ta 020517s1978 ilu r |||| u|eng d (iLib)UPD-00000305407 DCHE eng DMLUC HF 5694 M37 Mason, Robert D. 1919- Programmed learning aid for business and consumer mathematics Robert D. Mason, Walter H. Lange, Temoleon G. Rousos ; coordinating editor, Roger H. Hermanson. Homewood, Ill. Learning Systems 1978. 142 p. Programmed Learning Aid Series Business mathematics Programmed instruction. Book FO Monograph UPD DCHE HF 5694 M37 Book