Burt, William Austin, 1792-1858, Hodgson, John, Mullett, John, 1786-1862 (1839). 31N 01W - Survey Map of Charlton Township, Otsego County [Michigan]. Department of Natural Resources. https://michigan.access.preservica.com/uncategorized/IO_e5ff4e47-da9a-40a4-be23-cef2b6582cda (map)