Burt, William Austin, 1792-1858, Searles, Zelotes B. (1841). 47N 21W - Survey Map of Onota Township, Alger County [Michigan]. Department of Natural Resources. https://michigan.access.preservica.com/uncategorized/IO_5e2a268e-1e1d-4f64-8807-8b44d16a57b7 (map)