A Very Brief History of the Wisconsin Mineral Development Atlas: General Information and Procedures Concerning Zinc-Lead Atlas Open-file report; contains unpublished data that has not yet been peer-reviewed. Metallic Minerals Rocks and Minerals Data and Resources WOFR1980-04 A Very Brief History of the Wisconsin Mineral Development Atlas & General Information and Procedures Concerning Zinc-Lead Atlas Heyl, A.V.; Broughton, W.A.; 1980 Report: 6 p. Download Related Collections Open-File Report View Open-File Report