Preliminary digital geologic map of the Penokean (Early Proterozoic) Continental Margin in northern Michigan and Wisconsin / by W.F. Cannon and D. Ottke.
Contributors: Ottke, D.
Series: U.S. Geological Survey.  Open file report 99-547
Publisher: Dept. of the Interior
Place of publication: Washington
Language: eng
Subjects: Geology - Michigan; Geology - Wisconsin
Notes: 11