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<p>Book digitized by Google from the library of Harvard University and uploaded to the Internet Archive by user tpb.
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<br>Subjects: ann; saginaw; salt; arbor; geological; lake; grand; coal; sandstone; shore; ann arbor; thunder bay; grand traverse; specific gravity; coal measures; lower peninsula; grand rapids; black bituminous; onondaga salt; salt group</div>
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Michigan Geological Survey,  Alexander Winchell,  Geological Survey,  Michigan</div>
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