@base . a ; . a , ; "Report of investigation - Geological Survey (Lansing)" . a . "Michigan" . a ; "0543-8497" ; . a , , ; , , ; "Report of investigation - Geological Survey Division." ; ; ; "0543-8497" ; ; "0543-8497" ; ; "0543-8497" ; "Report of investigation - Geological Survey (Lansing)" , "Report of investigation - Geological Survey Division." ; . a ; ; "20050914132200.0"^^ ; ; . . a ; "0543-8497" ; .