Burt, William Austin, 1792-1858, Searles, Zelotes B. (1841). 44N 21W - Survey Map of Mathias Township, Alger County [Michigan]. Department of Natural Resources. https://michigan.access.preservica.com/uncategorized/IO_df63afc8-0f19-4cf7-b25a-bc5577e925f9 (map)