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
"Wilmarth, M. Grace (Mary Grace)","The geologic time classification of the United States geological survey compared with other classifications : accompanied by the original definitions of era, period and epoch terms",,Government Printing Office,1925,Geological Survey bulletin,,,,https://cir.nii.ac.jp/crid/1130282273296140672