Author,Title,Edition,Publisher,Year,Series,Number,ISBN,ISSN,URL
"Todd, J. E. (James Edward) and Geological Survey (U.S.)","Elk Point folio, South Dakota-Nebraska-Iowa",,U.S. Geological Survey,1908,Geologic atlas of the United States,,,,https://cir.nii.ac.jp/crid/1130000796498789504