text Jakarta LEKNAS - LIPI 1977 XII, 142 p. ill ; 23 cm PERTANIAN - EKONOMI PERTANIAN EKONOMI SEJARAH SUMATERA 63 63 INLIS000000000004122 Converted from MARCXML to MODS version 3.5 using MARC21slim2MODS3-5.xsl (Revision 1.106 2014/12/19)