Studies of Sub-Surface Geology in Wisconsin, 1923-1957 Open-file report; contains unpublished data that has not yet been peer-reviewed. Bedrock Geology Surficial Geology Data and Resources WOFR1957-01 Studies of Sub-Surface Geology in Wisconsin, 1923-1957 Thwaites, F.T.; 1957 Report: 95 p. Download Related Collections Open-File Report View Open-File Report