Burt, William Austin, 1792-1858, Burton, John W. (John Wear), 1915-2010, Houck, Francis S. (1846). 46N 32W - Survey Map of Crystal Falls Township, Iron County [Michigan]. Department of Natural Resources. https://michigan.access.preservica.com/uncategorized/IO_c8dd681d-480a-4501-aadd-f2703eb8f9ad (map)