Muhamad Yusa, Koichi Yamamoto, Atsushi Koyama, Sigit Sutikno, Ferry Fatnanta, Manyuk Fauzi and Besri Nasrul 2021. GEOTECHNICAL CHARACTERIZATION OF BENGKALIS’ PEAT USING PORTABLE TOOLS. GEOMATE Journal. 20, 80 (Apr. 2021), 113–120.