Burt, William Austin, 1792-1858, Burton, John W. (John Wear), 1915-2010 (1846). 41N 32W - Survey Map of Mastodon Township, Iron County [Michigan]. Department of Natural Resources. https://michigan.access.preservica.com/uncategorized/IO_11fd4d61-3249-47e6-b275-6456163a9fe6 (map)