Burt, William Austin, 1792-1858, Searles, Zelotes B. (1847). 46N 38W - Survey Map of Interior Township, Ontonagon County [Michigan]. Department of Natural Resources. https://michigan.access.preservica.com/uncategorized/IO_451ed1b8-4fad-4ebc-bdf6-ae37edb8f0b2 (map)