Chemical Analyses of Wisconsin Clays and Shales from Publications and Files of the Wisconsin Geological and Natural History Survey Open-file report; contains unpublished data that has not yet been peer-reviewed. Data and Resources WOFR1975-04 Chemical Analyses of Wisconsin Clays and Shales From Publications and Files of the Wisconsin Geological and Natural History Survey Ostrom, M.E.; 1975 Report: 17 p. Download Related Collections Open-File Report View Open-File Report