Bibliography of Precambrian Geology of Wisconsin 1778-1968 Open-file report; contains unpublished data that has not yet been peer-reviewed. Bedrock Geology Precambrian Bedrock Data and Resources WOFR1971-04 Bibliography of Precambrian Geology of Wisconsin 1778-1968 Dutton, C.E.; Bradley, R.E.; 1971 Report: 28 p. Download Related Collections Open-File Report View Open-File Report