Burt, William Austin, 1792-1858, Hill, S. W. (Samuel Worth), 1815-1889, Houghton, Douglass, 1809-1845 (1845). 58N 29W - Survey Map of Grant Township, Keweenaw County, page 2 [Michigan]. Department of Natural Resources. https://michigan.access.preservica.com/uncategorized/IO_14dd3412-8f5e-4d8e-b493-a9b9fd503cda (map)