Nyakpa M. Yusuf text Lampung Unila 1988 ind "xii, 258 p. : ills. ; 20 cm" M. Yusuf Nyakpa SOIL FERTILITY 631.4 631.4 NYA k 631.4 220614 20220614104023 INLIS000000000000579 Converted from MARCXML to MODS version 3.5 using MARC21slim2MODS3-5.xsl (Revision 1.106 2014/12/19)