Author,Title,Edition,Publisher,Year,Series,Number,ISBN,ISSN,URL
"Cross, Whitman and Spencer, Arthur C. (Arthur Coe) and Purington, Chester Wells and Geological Survey (U.S.)","La Plata folio, Colorado",Library ed,U.S. Geological Survey,1899,Geologic atlas of the United States,,,,https://cir.nii.ac.jp/crid/1130282271235709952