1. Pre-Quaternary geologic and magnetic map and sections of part of the eastern Gogebic Iron Range, Michigan [cartographic material] Yale Public content 1967. 2012-10-04T20:00:50Z. 2013-03-18T22:21:51Z. Prinz, William C., 1928-. U.S. Geological Survey. English. Public. Michigan and Gogebic County. Pre-Quaternary.