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
"Leverett, Frank and Sardeson, Frederick W. and Purssell, U. G.",Surface formations and agricultural conditions of Northeastern Minnesota . climatic conditions of Minnesota,,University of Minnesota,1917,Bulletin (Minnesota Geological Survey),,,,https://cir.nii.ac.jp/crid/1130282272621986304