risalah diskusi ilmiah hasil penelitian text Malang Badan Litbang Pertanian 1989 DRY FARMING SOIL CONSERVATION WATERSHEDS LAHAN KERING KONSERVASI DAS 631 631 INLIS000000000002130 Converted from MARCXML to MODS version 3.5 using MARC21slim2MODS3-5.xsl (Revision 1.106 2014/12/19)