Burt, William Austin, 1792-1858, Searles, Zelotes B. (1841). 48N 21W - Survey Map of Onota Township, Alger County [Michigan]. Department of Natural Resources. https://michigan.access.preservica.com/uncategorized/IO_fa184999-9cd6-4b65-8d66-56cda9b8ede5 (map)