Burt, William (Surveyor), Burt, William Austin, 1792-1858 (1847). 47N 43W - Survey Map of Mareninsco Township, Gogebic County [Michigan]. Department of Natural Resources. https://michigan.access.preservica.com/uncategorized/IO_cce32bc8-6c8c-4226-807f-032aa1e9dbd3 (map)