The Thunder Bay Marine Sanctuary Field Station in Alpena, MI. Image courtesy of Thunder Bay Sinkholes 2008.
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Thunder Bay Sinkholes 2008: Sept 12 Log
Download high-resolution image (jpg, 344 Kb)
The Thunder Bay Marine Sanctuary Field Station in Alpena, MI. Image courtesy of Thunder Bay Sinkholes 2008.
Thunder Bay Sinkholes 2008: Sept 12 Log
Download high-resolution image (jpg, 344 Kb)