Burt, William Austin, 1792-1858, Burton, John W. (John Wear), 1915-2010, Searles, Zelotes B. (1846). 42N 32W - Survey Map of Mastodon Township, Iron County, Page 1 [Michigan]. Department of Natural Resources. https://michigan.access.preservica.com/uncategorized/IO_ef384d6f-63b1-48d0-9bf4-bb73a8ab2fc5 (map)