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 "Helfrich, Charles T.","Silurian conodonts from Wills Mountain anticline, Virginia, West Virginia, and Maryland",,Geological Society of America,1975,Special paper,,081372161X,,https://cir.nii.ac.jp/crid/1130000797961380608