Burt, William Austin, 1792-1858, Burton, John W. (John Wear), 1915-2010 (1846). 47N 29W - Survey Map of Humboldt Township, Marquette County [Michigan]. Department of Natural Resources. https://michigan.access.preservica.com/uncategorized/IO_abb0c182-60dd-4460-b65f-fea12cb13df3 (map)