Burt, William (Surveyor), Mullett, John, 1786-1862 (1840). 32N 04W - Survey Map of Hudson Township and Thumb Lake islands, Charlevoix County, Page 1 [Michigan]. Department of Natural Resources. https://michigan.access.preservica.com/uncategorized/IO_04c284b7-306d-4813-923a-9ad33d50d3e3 (map)