Digital bedrock geologic map of the Ashland and northern part of the Ironwood 30'x60' quadrangles, Wisconsin and Michigan / W.F. Cannon [and others]
Series: U.S. Geological Survey.  Open file report 99-546
Publisher: Dept. of the Interior
Place of publication: Washington
Language: eng
Subjects: Geology - Wisconsin; Geology - Michigan
Notes: 11