Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) AIHARA Atsuo and NAKAMURA Moriyuki and ASOU Teruo and MINETOMA Shyogo,"Coalification pattern and organic metamorphism in the Ishikari coalfield, Japan.",Mining Geology,0026-5209,The Society of Resource Geology,1980,30,162,229-240,https://cir.nii.ac.jp/crid/1390282681502467200,https://doi.org/10.11456/shigenchishitsu1951.30.229