著者名,書名,版表示,出版者名,出版年,シリーズ名,番号,ISBN,ISSN,URL Geological Survey (U.S.) and National Coal Resource Assessment (U.S.),2000 resource assessment of selected coal beds and zones in the Northern and Central Appalachian Basin coal regions,Version 1.0,U.S. Geological Survey,2001,Geological Survey professional paper,,0607962445,,https://cir.nii.ac.jp/crid/1130282270368134016