Burt, William Austin, 1792-1858, Houghton, Douglass, 1809-1845 (1845). 58N 27W - Survey Map of Grant Township, Keweenaw County [Michigan]. Department of Natural Resources. https://michigan.access.preservica.com/uncategorized/IO_d7bb515d-7230-4a52-ae64-393116a70c89 (map)