text Surakarta Widya Duta 1987 I 177 hlm. 20 cm MATHEMATIC-STUDY AND TEACHING 510.7 510.7 Bud m INLIS000000000006139 Converted from MARCXML to MODS version 3.5 using MARC21slim2MODS3-5.xsl (Revision 1.106 2014/12/19)