A methodology for on-farm cropping systems research text Manila IRRI 1981 viii, 150 p. : ills. ; 23 cm. SISTEM PERTANIAN - PENELITIAN PENELITIAN 631.58 631.58 INLIS000000000004292 Converted from MARCXML to MODS version 3.5 using MARC21slim2MODS3-5.xsl (Revision 1.106 2014/12/19)