Michigan - State Geology Digital Documents - Guides at University of Iowa

Michigan Geological Survey (Department of Geological and Environmental Sciences, Western Michigan University)

Michigan Geological Survey Publications
Digital access to some documents, but most publications and maps at this site are for sale only.
Digital Geology Library (Michigan Office of Geological Survey)
A PDF catalog of publications with links to the PDFs of digitized and reformatted versions of original documents, which are primarily archival in nature.
Geology in Michigan (Michigan Department of Environment, Great Lakes, and Energy)
Links to other web resources for Michigan geology, including Digital Geology Library.

Geological Survey of Michigan [report]
v.1-9 (1869/73 - 1903/04)
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Also accessible in Digital Geology Library PDF catalog under heading of Volumes in section 40, p.37.
The mineralogy of Michigan by E. Wm. Heinrich (1976)
Bulletin (Michigan. Geological Survey Division) no.6