na INLIS000000000003010 20220701091500 0010-0521003010 220701 g 0 ind NONE Berita Kilat No. 42 Petundjuk pengambilan tjontoh tanah guna pemeriksaan tanah (Landjutan dari "Vlugschrift Algemeen Proefstation der AVROS") / Research Institute of The Sumatra Planters Association Medan : Avros, s.a 13 p., ill.; 20 cm SOIL SAMPLE RESEARCH RESEARCH INSTITUTE OF THE SUMATRA PLANTERS ASSOCIATION